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| author | Kartik K. Agaram <vc@akkartik.com> | 2016-05-21 17:44:53 -0700 |
|---|---|---|
| committer | Kartik K. Agaram <vc@akkartik.com> | 2016-05-21 17:44:53 -0700 |
| commit | 2f02189ddcdeb7d25b0ca9bd5b955b764d41a1a7 (patch) | |
| tree | 7c2e8b6e37ae3201dc01e90bcb390ee60b7f4a77 /html/057immutable.cc.html | |
| parent | 61c025b11ed4ddd002f09f061fd77c75d8b6d0ba (diff) | |
| download | mu-2f02189ddcdeb7d25b0ca9bd5b955b764d41a1a7.tar.gz | |
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| -rw-r--r-- | html/057immutable.cc.html | 602 |
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diff --git a/html/057immutable.cc.html b/html/057immutable.cc.html new file mode 100644 index 00000000..4d3b51fc --- /dev/null +++ b/html/057immutable.cc.html @@ -0,0 +1,602 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> +<html> +<head> +<meta http-equiv="content-type" content="text/html; charset=UTF-8"> +<title>Mu - 057immutable.cc</title> +<meta name="Generator" content="Vim/7.4"> +<meta name="plugin-version" content="vim7.4_v2"> +<meta name="syntax" content="cpp"> +<meta name="settings" content="use_css,pre_wrap,no_foldcolumn,expand_tabs,prevent_copy="> +<meta name="colorscheme" content="minimal"> +<style type="text/css"> +<!-- +pre { white-space: pre-wrap; font-family: monospace; color: #eeeeee; background-color: #080808; } +body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color: #080808; } +* { font-size: 12pt; font-size: 1em; } +.Constant { color: #00a0a0; } +.cSpecial { color: #008000; } +.traceContains { color: #008000; } +.Comment { color: #9090ff; } +.Delimiter { color: #800080; } +.Special { color: #c00000; } +.Identifier { color: #fcb165; } +.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; } +.Todo { color: #000000; background-color: #ffff00; padding-bottom: 1px; } +--> +</style> + +<script type='text/javascript'> +<!-- + +--> +</script> +</head> +<body> +<pre id='vimCodeElement'> +<span class="Comment">//: Ingredients of a recipe are meant to be immutable unless they're also</span> +<span class="Comment">//: products. This layer will start enforcing this check.</span> +<span class="Comment">//:</span> +<span class="Comment">//: One hole for now: variables in surrounding spaces are implicitly mutable.</span> + +<span class="Delimiter">:(scenario can_modify_ingredients_that_are_also_products)</span> +<span class="Comment"># mutable container</span> +def main [ + local-scope + <span class="Normal">p</span>:point<span class="Special"> <- </span>merge <span class="Constant">34</span><span class="Delimiter">,</span> <span class="Constant">35</span> + p<span class="Special"> <- </span>foo p +] +def foo p:point <span class="Delimiter">-></span> p:point [ + local-scope + load-ingredients + p<span class="Special"> <- </span>put p<span class="Delimiter">,</span> x:offset<span class="Delimiter">,</span> <span class="Constant">34</span> +] +$error: <span class="Constant">0</span> + +<span class="Delimiter">:(scenario can_modify_ingredients_that_are_also_products_2)</span> +def main [ + local-scope + <span class="Normal">p</span>:address:point<span class="Special"> <- </span><span class="Normal">new</span> point:type + p<span class="Special"> <- </span>foo p +] +<span class="Comment"># mutable address to container</span> +def foo p:address:point <span class="Delimiter">-></span> p:address:point [ + local-scope + load-ingredients + *p<span class="Special"> <- </span>put *p<span class="Delimiter">,</span> x:offset<span class="Delimiter">,</span> <span class="Constant">34</span> +] +$error: <span class="Constant">0</span> + +<span class="Delimiter">:(scenario can_modify_ingredients_that_are_also_products_3)</span> +def main [ + local-scope + <span class="Normal">p</span>:address:array:number<span class="Special"> <- </span><span class="Normal">new</span> number:type<span class="Delimiter">,</span> <span class="Constant">3</span> + p<span class="Special"> <- </span>foo p +] +<span class="Comment"># mutable address</span> +def foo p:address:array:number <span class="Delimiter">-></span> p:address:array:number [ + local-scope + load-ingredients + *p<span class="Special"> <- </span>put-index *p<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">34</span> +] +$error: <span class="Constant">0</span> + +<span class="Delimiter">:(scenario ignore_literal_ingredients_for_immutability_checks)</span> +def main [ + local-scope + <span class="Normal">p</span>:address:d1<span class="Special"> <- </span><span class="Normal">new</span> d1:type + <span class="Normal">q</span>:number<span class="Special"> <- </span>foo p +] +def foo p:address:d1 <span class="Delimiter">-></span> q:number [ + local-scope + load-ingredients + <span class="Normal">x</span>:address:d1<span class="Special"> <- </span><span class="Normal">new</span> d1:type + *x<span class="Special"> <- </span>put *x<span class="Delimiter">,</span> p:offset<span class="Delimiter">,</span> <span class="Constant">34</span> <span class="Comment"># ignore this 'p'</span> + reply <span class="Constant">36</span> +] +container d1 [ + <span class="Normal">p</span>:number + <span class="Normal">q</span>:number +] +$error: <span class="Constant">0</span> + +<span class="Delimiter">:(scenario cannot_modify_immutable_ingredients)</span> +<span class="Special">% Hide_errors = true;</span> +def main [ + local-scope + <span class="Normal">x</span>:address:number<span class="Special"> <- </span><span class="Normal">new</span> number:type + foo x +] +<span class="Comment"># immutable address to primitive</span> +def foo x:address:number [ + local-scope + load-ingredients + *x<span class="Special"> <- </span>copy <span class="Constant">34</span> +] +<span class="traceContains">+error: foo: cannot modify 'x' in instruction '*x <- copy 34' because it's an ingredient of recipe foo but not also a product</span> + +<span class="Delimiter">:(scenario cannot_modify_immutable_containers)</span> +<span class="Special">% Hide_errors = true;</span> +def main [ + local-scope + <span class="Normal">x</span>:point-number<span class="Special"> <- </span>merge <span class="Constant">34</span><span class="Delimiter">,</span> <span class="Constant">35</span><span class="Delimiter">,</span> <span class="Constant">36</span> + foo x +] +<span class="Comment"># immutable container</span> +def foo x:point-number [ + local-scope + load-ingredients + <span class="Comment"># copy an element: ok</span> + <span class="Normal">y</span>:point<span class="Special"> <- </span>get x<span class="Delimiter">,</span> xy:offset + <span class="Comment"># modify the element: boom</span> + <span class="Comment"># This could be ok if y contains no addresses, but we're not going to try to be that smart.</span> + <span class="Comment"># It also makes the rules easier to reason about. If it's just an ingredient, just don't try to change it.</span> + y<span class="Special"> <- </span>put y<span class="Delimiter">,</span> x:offset<span class="Delimiter">,</span> <span class="Constant">37</span> +] +<span class="traceContains">+error: foo: cannot modify 'y' in instruction 'y <- put y, x:offset, 37' because that would modify 'x' which is an ingredient of recipe foo but not also a product</span> + +<span class="Delimiter">:(scenario can_modify_immutable_pointers)</span> +def main [ + local-scope + <span class="Normal">x</span>:address:number<span class="Special"> <- </span><span class="Normal">new</span> number:type + foo x +] +def foo x:address:number [ + local-scope + load-ingredients + <span class="Comment"># modify the address, not the payload</span> + x<span class="Special"> <- </span>copy <span class="Constant">0</span> +] +$error: <span class="Constant">0</span> + +<span class="Delimiter">:(scenario can_modify_immutable_pointers_but_not_their_payloads)</span> +<span class="Special">% Hide_errors = true;</span> +def main [ + local-scope + <span class="Normal">x</span>:address:number<span class="Special"> <- </span><span class="Normal">new</span> number:type + foo x +] +def foo x:address:number [ + local-scope + load-ingredients + <span class="Comment"># modify address; ok</span> + x<span class="Special"> <- </span><span class="Normal">new</span> number:type + <span class="Comment"># modify payload: boom</span> + <span class="Comment"># this could be ok, but we're not going to try to be that smart</span> + *x<span class="Special"> <- </span>copy <span class="Constant">34</span> +] +<span class="traceContains">+error: foo: cannot modify 'x' in instruction '*x <- copy 34' because it's an ingredient of recipe foo but not also a product</span> + +<span class="Delimiter">:(scenario cannot_call_mutating_recipes_on_immutable_ingredients)</span> +<span class="Special">% Hide_errors = true;</span> +def main [ + local-scope + <span class="Normal">p</span>:address:point<span class="Special"> <- </span><span class="Normal">new</span> point:type + foo p +] +def foo p:address:point [ + local-scope + load-ingredients + bar p +] +def bar p:address:point <span class="Delimiter">-></span> p:address:point [ + local-scope + load-ingredients + <span class="Comment"># p could be modified here, but it doesn't have to be, it's already marked</span> + <span class="Comment"># mutable in the header</span> +] +<span class="traceContains">+error: foo: cannot modify 'p' in instruction 'bar p' because it's an ingredient of recipe foo but not also a product</span> + +<span class="Delimiter">:(scenario cannot_modify_copies_of_immutable_ingredients)</span> +<span class="Special">% Hide_errors = true;</span> +def main [ + local-scope + <span class="Normal">p</span>:address:point<span class="Special"> <- </span><span class="Normal">new</span> point:type + foo p +] +def foo p:address:point [ + local-scope + load-ingredients + <span class="Normal">q</span>:address:point<span class="Special"> <- </span>copy p + *q<span class="Special"> <- </span>put *q<span class="Delimiter">,</span> x:offset<span class="Delimiter">,</span> <span class="Constant">34</span> +] +<span class="traceContains">+error: foo: cannot modify 'q' in instruction '*q <- put *q, x:offset, 34' because that would modify p which is an ingredient of recipe foo but not also a product</span> + +<span class="Delimiter">:(scenario can_modify_copies_of_mutable_ingredients)</span> +def main [ + local-scope + <span class="Normal">p</span>:address:point<span class="Special"> <- </span><span class="Normal">new</span> point:type + foo p +] +def foo p:address:point <span class="Delimiter">-></span> p:address:point [ + local-scope + load-ingredients + <span class="Normal">q</span>:address:point<span class="Special"> <- </span>copy p + *q<span class="Special"> <- </span>put *q<span class="Delimiter">,</span> x:offset<span class="Delimiter">,</span> <span class="Constant">34</span> +] +$error: <span class="Constant">0</span> + +<span class="Delimiter">:(scenario cannot_modify_address_inside_immutable_ingredients)</span> +<span class="Special">% Hide_errors = true;</span> +container foo [ + <span class="Normal">x</span>:address:array:number <span class="Comment"># contains an address</span> +] +def main [ + <span class="Comment"># don't run anything</span> +] +def foo a:address:foo [ + local-scope + load-ingredients + <span class="Normal">x</span>:address:array:number<span class="Special"> <- </span>get *a<span class="Delimiter">,</span> x:offset <span class="Comment"># just a regular get of the container</span> + *x<span class="Special"> <- </span>put-index *x<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">34</span> <span class="Comment"># but then a put-index on the result</span> +] +<span class="traceContains">+error: foo: cannot modify 'x' in instruction '*x <- put-index *x, 0, 34' because that would modify a which is an ingredient of recipe foo but not also a product</span> + +<span class="Delimiter">:(scenario cannot_modify_address_inside_immutable_ingredients_2)</span> +container foo [ + <span class="Normal">x</span>:address:array:number <span class="Comment"># contains an address</span> +] +def main [ + <span class="Comment"># don't run anything</span> +] +def foo a:address:foo [ + local-scope + load-ingredients + <span class="Normal">b</span>:foo<span class="Special"> <- </span>merge <span class="Constant">0</span> + <span class="Comment"># modify b, completely unrelated to immutable ingredient a</span> + <span class="Normal">x</span>:address:array:number<span class="Special"> <- </span>get b<span class="Delimiter">,</span> x:offset + *x<span class="Special"> <- </span>put-index *x<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">34</span> +] +$error: <span class="Constant">0</span> + +<span class="Delimiter">:(scenario cannot_modify_address_inside_immutable_ingredients_3)</span> +<span class="Special">% Hide_errors = true;</span> +container foo [ + <span class="Normal">x</span>:number +] +def main [ + <span class="Comment"># don't run anything</span> +] +def foo a:address:array:address:number [ + local-scope + load-ingredients + <span class="Normal">x</span>:address:number<span class="Special"> <- </span>index *a<span class="Delimiter">,</span> <span class="Constant">0</span> <span class="Comment"># just a regular index of the array</span> + *x<span class="Special"> <- </span>copy <span class="Constant">34</span> <span class="Comment"># but then modify the result</span> +] +<span class="traceContains">+error: foo: cannot modify 'x' in instruction '*x <- copy 34' because that would modify a which is an ingredient of recipe foo but not also a product</span> + +<span class="Delimiter">:(scenario cannot_modify_address_inside_immutable_ingredients_4)</span> +container foo [ + <span class="Normal">x</span>:address:array:number <span class="Comment"># contains an address</span> +] +def main [ + <span class="Comment"># don't run anything</span> +] +def foo a:address:array:address:number [ + local-scope + load-ingredients + <span class="Normal">b</span>:address:array:address:number<span class="Special"> <- </span><span class="Normal">new</span> <span class="Delimiter">{(</span>address number<span class="Delimiter">)</span>: type<span class="Delimiter">},</span> <span class="Constant">3</span> + <span class="Comment"># modify b, completely unrelated to immutable ingredient a</span> + <span class="Normal">x</span>:address:number<span class="Special"> <- </span>index *b<span class="Delimiter">,</span> <span class="Constant">0</span> + *x<span class="Special"> <- </span>copy <span class="Constant">34</span> +] +$error: <span class="Constant">0</span> + +<span class="Delimiter">:(scenario can_traverse_immutable_ingredients)</span> +container test-list [ + <span class="Normal">next</span>:address:test-list +] +def main [ + local-scope + <span class="Normal">p</span>:address:test-list<span class="Special"> <- </span><span class="Normal">new</span> test-list:type + foo p +] +def foo p:address:test-list [ + local-scope + load-ingredients + <span class="Normal">p2</span>:address:test-list<span class="Special"> <- </span>bar p +] +def bar x:address:test-list <span class="Delimiter">-></span> y:address:test-list [ + local-scope + load-ingredients + y<span class="Special"> <- </span>get *x<span class="Delimiter">,</span> next:offset +] +$error: <span class="Constant">0</span> + +<span class="Delimiter">:(scenario treat_optional_ingredients_as_mutable)</span> +def main [ + <span class="Normal">k</span>:address:number<span class="Special"> <- </span><span class="Normal">new</span> number:type + test k +] +<span class="Comment"># recipe taking an immutable address ingredient</span> +def test k:address:number [ + local-scope + load-ingredients + foo k +] +<span class="Comment"># ..calling a recipe with an optional address ingredient</span> +def foo <span class="Delimiter">-></span> [ + local-scope + load-ingredients + <span class="Normal">k</span>:address:number<span class="Delimiter">,</span> found?:boolean<span class="Special"> <- </span>next-ingredient + <span class="Comment"># we don't further check k for immutability, but assume it's mutable</span> +] +$error: <span class="Constant">0</span> + +<span class="Delimiter">:(scenario treat_optional_ingredients_as_mutable_2)</span> +<span class="Special">% Hide_errors = true;</span> +def main [ + local-scope + <span class="Normal">p</span>:address:point<span class="Special"> <- </span><span class="Normal">new</span> point:type + foo p +] +def foo p:address:point [ + local-scope + load-ingredients + bar p +] +def bar [ + local-scope + load-ingredients + <span class="Normal">p</span>:address:point<span class="Special"> <- </span>next-ingredient <span class="Comment"># optional ingredient; assumed to be mutable</span> +] +<span class="traceContains">+error: foo: cannot modify 'p' in instruction 'bar p' because it's an ingredient of recipe foo but not also a product</span> + +<span class="Comment">//: when checking for immutable ingredients, remember to take space into account</span> +<span class="Delimiter">:(scenario check_space_of_reagents_in_immutability_checks)</span> +def main [ + <span class="Normal">a</span>:address:array:location<span class="Special"> <- </span><span class="Normal">new</span>-closure + <span class="Normal">b</span>:address:number<span class="Special"> <- </span><span class="Normal">new</span> number:type + run-closure b:address:number<span class="Delimiter">,</span> a:address:array:location +] +def <span class="Normal">new</span>-closure [ + <span class="Normal">new</span>-<span class="Normal">default</span>-space + <span class="Normal">x</span>:address:number<span class="Special"> <- </span><span class="Normal">new</span> number:type + <span class="Identifier">return</span> <span class="Normal">default</span>-space +] +def run-closure x:address:number<span class="Delimiter">,</span> s:address:array:location [ + local-scope + load-ingredients + <span class="Constant">0</span>:address:array:location/names:<span class="Normal">new</span>-closure<span class="Special"> <- </span>copy s + <span class="Comment"># different space; always mutable</span> + *x:address:number/space:<span class="Constant">1</span><span class="Special"> <- </span>copy <span class="Constant">34</span> +] +$error: <span class="Constant">0</span> + +<span class="Delimiter">:(before "End Transforms")</span> +Transform<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>check_immutable_ingredients<span class="Delimiter">);</span> <span class="Comment">// idempotent</span> + +<span class="Delimiter">:(code)</span> +<span class="Normal">void</span> check_immutable_ingredients<span class="Delimiter">(</span>recipe_ordinal r<span class="Delimiter">)</span> <span class="Delimiter">{</span> + <span class="Comment">// to ensure an address reagent isn't modified, it suffices to show that</span> + <span class="Comment">// a) we never write to its contents directly,</span> + <span class="Comment">// b) we never call 'put' or 'put-index' on it, and</span> + <span class="Comment">// c) any non-primitive recipe calls in the body aren't returning it as a product</span> + <span class="Normal">const</span> recipe& caller = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">);</span> + trace<span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">"transform"</span><span class="Delimiter">)</span> << <span class="Constant">"--- check mutability of ingredients in recipe "</span> << caller<span class="Delimiter">.</span>name << end<span class="Delimiter">();</span> + <span class="Normal">if</span> <span class="Delimiter">(</span>!caller<span class="Delimiter">.</span>has_header<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span> <span class="Comment">// skip check for old-style recipes calling next-ingredient directly</span> + <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < SIZE<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span> + <span class="Normal">const</span> reagent& current_ingredient = caller<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span> + <span class="Normal">if</span> <span class="Delimiter">(</span>is_present_in_products<span class="Delimiter">(</span>caller<span class="Delimiter">,</span> current_ingredient<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span> <span class="Comment">// not expected to be immutable</span> + <span class="Comment">// End Immutable Ingredients Special-cases</span> + set<reagent> immutable_vars<span class="Delimiter">;</span> + immutable_vars<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>current_ingredient<span class="Delimiter">);</span> + <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < SIZE<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>steps<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span> + <span class="Normal">const</span> instruction& inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span> + check_immutable_ingredient_in_instruction<span class="Delimiter">(</span>inst<span class="Delimiter">,</span> immutable_vars<span class="Delimiter">,</span> current_ingredient<span class="Delimiter">.</span>name<span class="Delimiter">,</span> caller<span class="Delimiter">);</span> + update_aliases<span class="Delimiter">(</span>inst<span class="Delimiter">,</span> immutable_vars<span class="Delimiter">);</span> + <span class="Delimiter">}</span> + <span class="Delimiter">}</span> +<span class="Delimiter">}</span> + +<span class="Normal">void</span> update_aliases<span class="Delimiter">(</span><span class="Normal">const</span> instruction& inst<span class="Delimiter">,</span> set<reagent>& current_ingredient_and_aliases<span class="Delimiter">)</span> <span class="Delimiter">{</span> + set<<span class="Normal">int</span>> current_ingredient_indices = ingredient_indices<span class="Delimiter">(</span>inst<span class="Delimiter">,</span> current_ingredient_and_aliases<span class="Delimiter">);</span> + <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>operation<span class="Delimiter">))</span> <span class="Delimiter">{</span> + <span class="Comment">// primitive recipe</span> + <span class="Normal">switch</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation<span class="Delimiter">)</span> <span class="Delimiter">{</span> + <span class="Normal">case</span> COPY: + <span class="Normal">for</span> <span class="Delimiter">(</span>set<<span class="Normal">int</span>>::iterator p = current_ingredient_indices<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != current_ingredient_indices<span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> + current_ingredient_and_aliases<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>*p<span class="Delimiter">).</span>name<span class="Delimiter">);</span> + <span class="Identifier">break</span><span class="Delimiter">;</span> + <span class="Normal">case</span> GET: + <span class="Normal">case</span> INDEX: + <span class="Normal">case</span> MAYBE_CONVERT: + <span class="Comment">// current_ingredient_indices can only have 0 or one value</span> + <span class="Normal">if</span> <span class="Delimiter">(</span>!current_ingredient_indices<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span> + <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_address<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> || is_mu_container<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> || is_mu_exclusive_container<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> + current_ingredient_and_aliases<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span> + <span class="Delimiter">}</span> + <span class="Identifier">break</span><span class="Delimiter">;</span> + <span class="Normal">default</span>: <span class="Identifier">break</span><span class="Delimiter">;</span> + <span class="Delimiter">}</span> + <span class="Delimiter">}</span> + <span class="Normal">else</span> <span class="Delimiter">{</span> + <span class="Comment">// defined recipe</span> + set<<span class="Normal">int</span>> contained_in_product_indices = scan_contained_in_product_indices<span class="Delimiter">(</span>inst<span class="Delimiter">,</span> current_ingredient_indices<span class="Delimiter">);</span> + <span class="Normal">for</span> <span class="Delimiter">(</span>set<<span class="Normal">int</span>>::iterator p = contained_in_product_indices<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != contained_in_product_indices<span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span> + <span class="Normal">if</span> <span class="Delimiter">(</span>*p < SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">))</span> + current_ingredient_and_aliases<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>*p<span class="Delimiter">));</span> + <span class="Delimiter">}</span> + <span class="Delimiter">}</span> +<span class="Delimiter">}</span> + +set<<span class="Normal">int</span>> scan_contained_in_product_indices<span class="Delimiter">(</span><span class="Normal">const</span> instruction& inst<span class="Delimiter">,</span> set<<span class="Normal">int</span>>& ingredient_indices<span class="Delimiter">)</span> <span class="Delimiter">{</span> + set<reagent> selected_ingredients<span class="Delimiter">;</span> + <span class="Normal">const</span> recipe& callee = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>operation<span class="Delimiter">);</span> + <span class="Normal">for</span> <span class="Delimiter">(</span>set<<span class="Normal">int</span>>::iterator p = ingredient_indices<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != ingredient_indices<span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span> + <span class="Normal">if</span> <span class="Delimiter">(</span>*p >= SIZE<span class="Delimiter">(</span>callee<span class="Delimiter">.</span>ingredients<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span> <span class="Comment">// optional immutable ingredient</span> + selected_ingredients<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>callee<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>*p<span class="Delimiter">));</span> + <span class="Delimiter">}</span> + set<<span class="Normal">int</span>> result<span class="Delimiter">;</span> + <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < SIZE<span class="Delimiter">(</span>callee<span class="Delimiter">.</span>products<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span> + <span class="Normal">const</span> reagent& current_product = callee<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span> + <span class="Comment">// </span><span class="Todo">TODO</span> + <span class="Normal">const</span> string_tree* contained_in_name = property<span class="Delimiter">(</span>current_product<span class="Delimiter">,</span> <span class="Constant">"contained-in"</span><span class="Delimiter">);</span> + <span class="Normal">if</span> <span class="Delimiter">(</span>contained_in_name && selected_ingredients<span class="Delimiter">.</span>find<span class="Delimiter">(</span>contained_in_name<span class="Delimiter">-></span>value<span class="Delimiter">)</span> != selected_ingredients<span class="Delimiter">.</span>end<span class="Delimiter">())</span> + result<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>i<span class="Delimiter">);</span> + <span class="Delimiter">}</span> + <span class="Identifier">return</span> result<span class="Delimiter">;</span> +<span class="Delimiter">}</span> + +<span class="Delimiter">:(scenarios transform)</span> +<span class="Delimiter">:(scenario immutability_infects_contained_in_variables)</span> +<span class="Special">% Hide_errors = true;</span> +container test-list [ + <span class="Normal">value</span>:number + <span class="Normal">next</span>:address:test-list +] +def main [ + local-scope + <span class="Normal">p</span>:address:test-list<span class="Special"> <- </span><span class="Normal">new</span> test-list:type + foo p +] +def foo p:address:test-list [ <span class="Comment"># p is immutable</span> + local-scope + load-ingredients + <span class="Normal">p2</span>:address:test-list<span class="Special"> <- </span>test-next p <span class="Comment"># p2 is immutable</span> + *p2<span class="Special"> <- </span>put *p2<span class="Delimiter">,</span> value:offset<span class="Delimiter">,</span> <span class="Constant">34</span> +] +def test-next x:address:test-list <span class="Delimiter">-></span> y:address:test-list/contained-in:x [ + local-scope + load-ingredients + y<span class="Special"> <- </span>get *x<span class="Delimiter">,</span> next:offset +] +<span class="traceContains">+error: foo: cannot modify 'p2' in instruction '*p2 <- put *p2, value:offset, 34' because that would modify p which is an ingredient of recipe foo but not also a product</span> + +<span class="Delimiter">:(code)</span> +<span class="Normal">void</span> check_immutable_ingredient_in_instruction<span class="Delimiter">(</span><span class="Normal">const</span> instruction& inst<span class="Delimiter">,</span> <span class="Normal">const</span> set<reagent>& current_ingredient_and_aliases<span class="Delimiter">,</span> <span class="Normal">const</span> string& original_ingredient_name<span class="Delimiter">,</span> <span class="Normal">const</span> recipe& caller<span class="Delimiter">)</span> <span class="Delimiter">{</span> + <span class="Comment">// first check if the instruction is directly modifying something it shouldn't</span> + <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span> + <span class="Normal">if</span> <span class="Delimiter">(</span>has_property<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 class="Constant">"lookup"</span><span class="Delimiter">)</span> + && current_ingredient_and_aliases<span class="Delimiter">.</span>find<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> != current_ingredient_and_aliases<span class="Delimiter">.</span>end<span class="Delimiter">())</span> <span class="Delimiter">{</span> + string current_product_name = inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">;</span> + <span class="Normal">if</span> <span class="Delimiter">(</span>current_product_name == original_ingredient_name<span class="Delimiter">)</span> + raise << maybe<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"cannot modify '"</span> << current_product_name << <span class="Constant">"' in instruction '"</span> << to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"' because it's an ingredient of recipe "</span> << caller<span class="Delimiter">.</span>name << <span class="Constant">" but not also a product</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span> + <span class="Normal">else</span> + raise << maybe<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"cannot modify '"</span> << current_product_name << <span class="Constant">"' in instruction '"</span> << to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"' because that would modify "</span> << original_ingredient_name << <span class="Constant">" which is an ingredient of recipe "</span> << caller<span class="Delimiter">.</span>name << <span class="Constant">" but not also a product</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span> + <span class="Identifier">return</span><span class="Delimiter">;</span> + <span class="Delimiter">}</span> + <span class="Delimiter">}</span> + <span class="Comment">// check if there's any indirect modification going on</span> + set<<span class="Normal">int</span>> current_ingredient_indices = ingredient_indices<span class="Delimiter">(</span>inst<span class="Delimiter">,</span> current_ingredient_and_aliases<span class="Delimiter">);</span> + <span class="Normal">if</span> <span class="Delimiter">(</span>current_ingredient_indices<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span> <span class="Comment">// ingredient not found in call</span> + <span class="Normal">for</span> <span class="Delimiter">(</span>set<<span class="Normal">int</span>>::iterator p = current_ingredient_indices<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != current_ingredient_indices<span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span> + <span class="Normal">const</span> <span class="Normal">int</span> current_ingredient_index = *p<span class="Delimiter">;</span> + reagent current_ingredient = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>current_ingredient_index<span class="Delimiter">);</span> + canonize_type<span class="Delimiter">(</span>current_ingredient<span class="Delimiter">);</span> + <span class="Normal">const</span> string& current_ingredient_name = current_ingredient<span class="Delimiter">.</span>name<span class="Delimiter">;</span> + <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>operation<span class="Delimiter">))</span> <span class="Delimiter">{</span> + <span class="Comment">// primitive recipe</span> + <span class="Comment">// we got here only because we got an instruction with an implicit product, and the instruction didn't explicitly spell it out</span> + <span class="Comment">// put x, y:offset, z</span> + <span class="Comment">// instead of</span> + <span class="Comment">// x <- put x, y:offset, z</span> + <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation == PUT || inst<span class="Delimiter">.</span>operation == PUT_INDEX<span class="Delimiter">)</span> <span class="Delimiter">{</span> + <span class="Normal">if</span> <span class="Delimiter">(</span>current_ingredient_index == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span> + <span class="Normal">if</span> <span class="Delimiter">(</span>current_ingredient_name == original_ingredient_name<span class="Delimiter">)</span> + raise << maybe<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"cannot modify '"</span> << current_ingredient_name << <span class="Constant">"' in instruction '"</span> << to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"' because it's an ingredient of recipe "</span> << caller<span class="Delimiter">.</span>name << <span class="Constant">" but not also a product</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span> + <span class="Normal">else</span> + raise << maybe<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"cannot modify '"</span> << current_ingredient_name << <span class="Constant">"' in instruction '"</span> << to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"' because that would modify '"</span> << original_ingredient_name << <span class="Constant">"' which is an ingredient of recipe "</span> << caller<span class="Delimiter">.</span>name << <span class="Constant">" but not also a product</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span> + <span class="Delimiter">}</span> + <span class="Delimiter">}</span> + <span class="Delimiter">}</span> + <span class="Normal">else</span> <span class="Delimiter">{</span> + <span class="Comment">// defined recipe</span> + <span class="Normal">if</span> <span class="Delimiter">(</span>is_modified_in_recipe<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation<span class="Delimiter">,</span> current_ingredient_index<span class="Delimiter">,</span> caller<span class="Delimiter">))</span> <span class="Delimiter">{</span> + <span class="Normal">if</span> <span class="Delimiter">(</span>current_ingredient_name == original_ingredient_name<span class="Delimiter">)</span> + raise << maybe<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"cannot modify '"</span> << current_ingredient_name << <span class="Constant">"' in instruction '"</span> << to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"' because it's an ingredient of recipe "</span> << caller<span class="Delimiter">.</span>name << <span class="Constant">" but not also a product</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span> + <span class="Normal">else</span> + raise << maybe<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"cannot modify '"</span> << current_ingredient_name << <span class="Constant">"' in instruction '"</span> << to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"' because that would modify '"</span> << original_ingredient_name << <span class="Constant">"' which is an ingredient of recipe "</span> << caller<span class="Delimiter">.</span>name << <span class="Constant">" but not also a product</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span> + <span class="Delimiter">}</span> + <span class="Delimiter">}</span> + <span class="Delimiter">}</span> +<span class="Delimiter">}</span> + +<span class="Normal">bool</span> is_modified_in_recipe<span class="Delimiter">(</span>recipe_ordinal r<span class="Delimiter">,</span> <span class="Normal">int</span> ingredient_index<span class="Delimiter">,</span> <span class="Normal">const</span> recipe& caller<span class="Delimiter">)</span> <span class="Delimiter">{</span> + <span class="Normal">const</span> recipe& callee = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">);</span> + <span class="Normal">if</span> <span class="Delimiter">(</span>!callee<span class="Delimiter">.</span>has_header<span class="Delimiter">)</span> <span class="Delimiter">{</span> + raise << maybe<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"can't check mutability of ingredients in recipe "</span> << callee<span class="Delimiter">.</span>name << <span class="Constant">" because it uses 'next-ingredient' directly, rather than a recipe header.</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span> + <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span> + <span class="Delimiter">}</span> + <span class="Normal">if</span> <span class="Delimiter">(</span>ingredient_index >= SIZE<span class="Delimiter">(</span>callee<span class="Delimiter">.</span>ingredients<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span> <span class="Comment">// optional immutable ingredient</span> + <span class="Identifier">return</span> is_present_in_products<span class="Delimiter">(</span>callee<span class="Delimiter">,</span> callee<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">).</span>name<span class="Delimiter">);</span> +<span class="Delimiter">}</span> + +<span class="Normal">bool</span> is_present_in_products<span class="Delimiter">(</span><span class="Normal">const</span> recipe& callee<span class="Delimiter">,</span> <span class="Normal">const</span> string& ingredient_name<span class="Delimiter">)</span> <span class="Delimiter">{</span> + <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < SIZE<span class="Delimiter">(</span>callee<span class="Delimiter">.</span>products<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span> + <span class="Normal">if</span> <span class="Delimiter">(</span>callee<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name == ingredient_name<span class="Delimiter">)</span> + <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span> + <span class="Delimiter">}</span> + <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span> +<span class="Delimiter">}</span> + +<span class="Normal">bool</span> is_present_in_ingredients<span class="Delimiter">(</span><span class="Normal">const</span> recipe& callee<span class="Delimiter">,</span> <span class="Normal">const</span> string& ingredient_name<span class="Delimiter">)</span> <span class="Delimiter">{</span> + <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < SIZE<span class="Delimiter">(</span>callee<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span> + <span class="Normal">if</span> <span class="Delimiter">(</span>callee<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name == ingredient_name<span class="Delimiter">)</span> + <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span> + <span class="Delimiter">}</span> + <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span> +<span class="Delimiter">}</span> + +set<<span class="Normal">int</span>> ingredient_indices<span class="Delimiter">(</span><span class="Normal">const</span> instruction& inst<span class="Delimiter">,</span> <span class="Normal">const</span> set<reagent>& ingredient_names<span class="Delimiter">)</span> <span class="Delimiter">{</span> + set<<span class="Normal">int</span>> result<span class="Delimiter">;</span> + <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span> + <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span> + <span class="Normal">if</span> <span class="Delimiter">(</span>ingredient_names<span class="Delimiter">.</span>find<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> != ingredient_names<span class="Delimiter">.</span>end<span class="Delimiter">())</span> + result<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>i<span class="Delimiter">);</span> + <span class="Delimiter">}</span> + <span class="Identifier">return</span> result<span class="Delimiter">;</span> +<span class="Delimiter">}</span> + +<span class="Comment">//: Sometimes you want to pass in two addresses, one pointing inside the</span> +<span class="Comment">//: other. For example, you want to delete a node from a linked list. You</span> +<span class="Comment">//: can't pass both pointers back out, because if a caller tries to make both</span> +<span class="Comment">//: identical then you can't tell which value will be written on the way out.</span> +<span class="Comment">//:</span> +<span class="Comment">//: Experimental solution: just tell mu that one points inside the other.</span> +<span class="Comment">//: This way we can return just one pointer as high up as necessary to capture</span> +<span class="Comment">//: all modifications performed by a recipe.</span> +<span class="Comment">//:</span> +<span class="Comment">//: We'll see if we end up wanting to abuse /contained-in for other reasons.</span> + +<span class="Delimiter">:(scenarios transform)</span> +<span class="Delimiter">:(scenario can_modify_contained_in_addresses)</span> +container test-list [ + <span class="Normal">value</span>:number + <span class="Normal">next</span>:address:test-list +] +def main [ + local-scope + <span class="Normal">p</span>:address:test-list<span class="Special"> <- </span><span class="Normal">new</span> test-list:type + foo p +] +def foo p:address:test-list <span class="Delimiter">-></span> p:address:test-list [ + local-scope + load-ingredients + <span class="Normal">p2</span>:address:test-list<span class="Special"> <- </span>test-next p + p<span class="Special"> <- </span>test-remove p2<span class="Delimiter">,</span> p +] +def test-next x:address:test-list <span class="Delimiter">-></span> y:address:test-list [ + local-scope + load-ingredients + y<span class="Special"> <- </span>get *x<span class="Delimiter">,</span> next:offset +] +def test-remove x:address:test-list/contained-in:from<span class="Delimiter">,</span> from:address:test-list <span class="Delimiter">-></span> from:address:test-list [ + local-scope + load-ingredients + *x<span class="Special"> <- </span>put *x<span class="Delimiter">,</span> value:offset<span class="Delimiter">,</span> <span class="Constant">34</span> <span class="Comment"># can modify x</span> +] +$error: <span class="Constant">0</span> + +<span class="Delimiter">:(before "End Immutable Ingredients Special-cases")</span> +<span class="Normal">if</span> <span class="Delimiter">(</span>has_property<span class="Delimiter">(</span>current_ingredient<span class="Delimiter">,</span> <span class="Constant">"contained-in"</span><span class="Delimiter">))</span> <span class="Delimiter">{</span> + <span class="Normal">const</span> string_tree* tmp = property<span class="Delimiter">(</span>current_ingredient<span class="Delimiter">,</span> <span class="Constant">"contained-in"</span><span class="Delimiter">);</span> + <span class="Normal">if</span> <span class="Delimiter">(</span>tmp<span class="Delimiter">-></span>left || tmp<span class="Delimiter">-></span>right + || !is_present_in_ingredients<span class="Delimiter">(</span>caller<span class="Delimiter">,</span> tmp<span class="Delimiter">-></span>value<span class="Delimiter">)</span> + || !is_present_in_products<span class="Delimiter">(</span>caller<span class="Delimiter">,</span> tmp<span class="Delimiter">-></span>value<span class="Delimiter">))</span> + raise << maybe<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"/contained-in can only point to another ingredient+product, but got '"</span> << to_string<span class="Delimiter">(</span>property<span class="Delimiter">(</span>current_ingredient<span class="Delimiter">,</span> <span class="Constant">"contained-in"</span><span class="Delimiter">))</span> << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span> + <span class="Identifier">continue</span><span class="Delimiter">;</span> +<span class="Delimiter">}</span> +</pre> +</body> +</html> +<!-- vim: set foldmethod=manual : --> |