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<pre id='vimCodeElement'>
<span class="Comment">//: Containers contain a fixed number of elements of different types.</span>
<span class="Delimiter">:(before "End Mu Types Initialization")</span>
<span class="Comment">//: We'll use this container as a running example, with two number elements.</span>
type_ordinal point = put<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">"point"</span><span class="Delimiter">,</span> Next_type_ordinal++<span class="Delimiter">);</span>
get_or_insert<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> point<span class="Delimiter">);</span> <span class="Comment">// initialize</span>
get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> point<span class="Delimiter">).</span>kind = CONTAINER<span class="Delimiter">;</span>
get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> point<span class="Delimiter">).</span>name = <span class="Constant">"point"</span><span class="Delimiter">;</span>
get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> point<span class="Delimiter">).</span>elements<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>reagent<span class="Delimiter">(</span><span class="Constant">"x:number"</span><span class="Delimiter">));</span>
get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> point<span class="Delimiter">).</span>elements<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>reagent<span class="Delimiter">(</span><span class="Constant">"y:number"</span><span class="Delimiter">));</span>
<span class="Comment">//: Containers can be copied around with a single instruction just like</span>
<span class="Comment">//: numbers, no matter how large they are.</span>
<span class="Comment">//: Tests in this layer often explicitly setup memory before reading it as a</span>
<span class="Comment">//: container. Don't do this in general. I'm tagging exceptions with /raw to</span>
<span class="Comment">//: avoid errors.</span>
<span class="Delimiter">:(scenario copy_multiple_locations)</span>
def main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">34</span>
<span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">35</span>
<span class="Constant">3</span>:point<span class="Special"> <- </span>copy <span class="Constant">1</span>:point/unsafe
]
<span class="traceContains">+mem: storing 34 in location 3</span>
<span class="traceContains">+mem: storing 35 in location 4</span>
<span class="Comment">//: trying to copy to a differently-typed destination will fail</span>
<span class="Delimiter">:(scenario copy_checks_size)</span>
<span class="Special">% Hide_errors = true;</span>
def main [
<span class="Constant">2</span>:point<span class="Special"> <- </span>copy <span class="Constant">1</span>:number
]
<span class="traceContains">+error: main: can't copy 1:number to 2:point; types don't match</span>
<span class="Delimiter">:(before "End Mu Types Initialization")</span>
<span class="Comment">// A more complex container, containing another container as one of its</span>
<span class="Comment">// elements.</span>
type_ordinal point_number = put<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">"point-number"</span><span class="Delimiter">,</span> Next_type_ordinal++<span class="Delimiter">);</span>
get_or_insert<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> point_number<span class="Delimiter">);</span> <span class="Comment">// initialize</span>
get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> point_number<span class="Delimiter">).</span>kind = CONTAINER<span class="Delimiter">;</span>
get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> point_number<span class="Delimiter">).</span>name = <span class="Constant">"point-number"</span><span class="Delimiter">;</span>
get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> point_number<span class="Delimiter">).</span>elements<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>reagent<span class="Delimiter">(</span><span class="Constant">"xy:point"</span><span class="Delimiter">));</span>
get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> point_number<span class="Delimiter">).</span>elements<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>reagent<span class="Delimiter">(</span><span class="Constant">"z:number"</span><span class="Delimiter">));</span>
<span class="Delimiter">:(scenario copy_handles_nested_container_elements)</span>
def main [
<span class="Constant">12</span>:number<span class="Special"> <- </span>copy <span class="Constant">34</span>
<span class="Constant">13</span>:number<span class="Special"> <- </span>copy <span class="Constant">35</span>
<span class="Constant">14</span>:number<span class="Special"> <- </span>copy <span class="Constant">36</span>
<span class="Constant">15</span>:point-number<span class="Special"> <- </span>copy <span class="Constant">12</span>:point-number/unsafe
]
<span class="traceContains">+mem: storing 36 in location 17</span>
<span class="Comment">//: products of recipes can include containers</span>
<span class="Delimiter">:(scenario return_container)</span>
def main [
<span class="Constant">3</span>:point<span class="Special"> <- </span>f <span class="Constant">2</span>
]
def f [
<span class="Constant">12</span>:number<span class="Special"> <- </span>next-ingredient
<span class="Constant">13</span>:number<span class="Special"> <- </span>copy <span class="Constant">35</span>
<span class="Identifier">return</span> <span class="Constant">12</span>:point/<span class="Special">raw</span>
]
<span class="traceContains">+run: result 0 is [2, 35]</span>
<span class="traceContains">+mem: storing 2 in location 3</span>
<span class="traceContains">+mem: storing 35 in location 4</span>
<span class="Comment">//: Containers can be checked for equality with a single instruction just like</span>
<span class="Comment">//: numbers, no matter how large they are.</span>
<span class="Delimiter">:(scenario compare_multiple_locations)</span>
def main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">34</span> <span class="Comment"># first</span>
<span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">35</span>
<span class="Constant">3</span>:number<span class="Special"> <- </span>copy <span class="Constant">36</span>
<span class="Constant">4</span>:number<span class="Special"> <- </span>copy <span class="Constant">34</span> <span class="Comment"># second</span>
<span class="Constant">5</span>:number<span class="Special"> <- </span>copy <span class="Constant">35</span>
<span class="Constant">6</span>:number<span class="Special"> <- </span>copy <span class="Constant">36</span>
<span class="Constant">7</span>:boolean<span class="Special"> <- </span>equal <span class="Constant">1</span>:point-number/<span class="Special">raw</span><span class="Delimiter">,</span> <span class="Constant">4</span>:point-number/unsafe
]
<span class="traceContains">+mem: storing 1 in location 7</span>
<span class="Delimiter">:(scenario compare_multiple_locations_2)</span>
def main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">34</span> <span class="Comment"># first</span>
<span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">35</span>
<span class="Constant">3</span>:number<span class="Special"> <- </span>copy <span class="Constant">36</span>
<span class="Constant">4</span>:number<span class="Special"> <- </span>copy <span class="Constant">34</span> <span class="Comment"># second</span>
<span class="Constant">5</span>:number<span class="Special"> <- </span>copy <span class="Constant">35</span>
<span class="Constant">6</span>:number<span class="Special"> <- </span>copy <span class="Constant">37</span> <span class="Comment"># different</span>
<span class="Constant">7</span>:boolean<span class="Special"> <- </span>equal <span class="Constant">1</span>:point-number/<span class="Special">raw</span><span class="Delimiter">,</span> <span class="Constant">4</span>:point-number/unsafe
]
<span class="traceContains">+mem: storing 0 in location 7</span>
<span class="Delimiter">:(before "End size_of(type) Cases")</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-></span>value == -<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Comment">// error value, but we'll raise it elsewhere</span>
<span class="Identifier">return</span> <span class="Constant">1</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-></span>value == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
assert<span class="Delimiter">(</span>!type<span class="Delimiter">-></span>left && !type<span class="Delimiter">-></span>right<span class="Delimiter">);</span>
<span class="Identifier">return</span> <span class="Constant">1</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> type<span class="Delimiter">-></span>value<span class="Delimiter">))</span> <span class="Delimiter">{</span>
raise << <span class="Constant">"no such type "</span> << type<span class="Delimiter">-></span>value << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
type_info t = get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> type<span class="Delimiter">-></span>value<span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>t<span class="Delimiter">.</span>kind == CONTAINER<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Comment">// size of a container is the sum of the sizes of its elements</span>
<span class="Normal">int</span> result = <span class="Constant">0</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>t<span class="Delimiter">.</span>elements<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Comment">// todo: strengthen assertion to disallow mutual type recursion</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>t<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">-></span>value == type<span class="Delimiter">-></span>value<span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << <span class="Constant">"container "</span> << t<span class="Delimiter">.</span>name << <span class="Constant">" can't include itself as a member</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
reagent tmp<span class="Delimiter">;</span>
tmp<span class="Delimiter">.</span>type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span>*type<span class="Delimiter">);</span>
result += size_of<span class="Delimiter">(</span>element_type<span class="Delimiter">(</span>tmp<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">:(scenario stash_container)</span>
def main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">34</span> <span class="Comment"># first</span>
<span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">35</span>
<span class="Constant">3</span>:number<span class="Special"> <- </span>copy <span class="Constant">36</span>
stash [foo:]<span class="Delimiter">,</span> <span class="Constant">1</span>:point-number/<span class="Special">raw</span>
]
<span class="traceContains">+app: foo: 34 35 36</span>
<span class="SalientComment">//:: To access elements of a container, use 'get'</span>
<span class="Delimiter">:(scenario get)</span>
def main [
<span class="Constant">12</span>:number<span class="Special"> <- </span>copy <span class="Constant">34</span>
<span class="Constant">13</span>:number<span class="Special"> <- </span>copy <span class="Constant">35</span>
<span class="Constant">15</span>:number<span class="Special"> <- </span>get <span class="Constant">12</span>:point/<span class="Special">raw</span><span class="Delimiter">,</span> <span class="Constant">1</span>:offset <span class="Comment"># unsafe</span>
]
<span class="traceContains">+mem: storing 35 in location 15</span>
<span class="Delimiter">:(before "End Primitive Recipe Declarations")</span>
GET<span class="Delimiter">,</span>
<span class="Delimiter">:(before "End Primitive Recipe Numbers")</span>
put<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">"get"</span><span class="Delimiter">,</span> GET<span class="Delimiter">);</span>
<span class="Delimiter">:(before "End Primitive Recipe Checks")</span>
<span class="Normal">case</span> GET: <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> << <span class="Constant">"'get' expects exactly 2 ingredients in '"</span> << to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
reagent base = inst<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="Comment">// new copy for every invocation</span>
<span class="Comment">// Update GET base in Check</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!base<span class="Delimiter">.</span>type || !base<span class="Delimiter">.</span>type<span class="Delimiter">-></span>value || !contains_key<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base<span class="Delimiter">.</span>type<span class="Delimiter">-></span>value<span class="Delimiter">)</span> || get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base<span class="Delimiter">.</span>type<span class="Delimiter">-></span>value<span class="Delimiter">).</span>kind != CONTAINER<span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> << <span class="Constant">"first ingredient of 'get' should be a container, but got "</span> << inst<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> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
type_ordinal base_type = base<span class="Delimiter">.</span>type<span class="Delimiter">-></span>value<span class="Delimiter">;</span>
reagent offset = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!is_literal<span class="Delimiter">(</span>offset<span class="Delimiter">)</span> || !is_mu_scalar<span class="Delimiter">(</span>offset<span class="Delimiter">))</span> <span class="Delimiter">{</span>
raise << maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> << <span class="Constant">"second ingredient of 'get' should have type 'offset', but got "</span> << inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Normal">int</span> offset_value = <span class="Constant">0</span><span class="Delimiter">;</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>is_integer<span class="Delimiter">(</span>offset<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Comment">// later layers permit non-integer offsets</span>
offset_value = to_integer<span class="Delimiter">(</span>offset<span class="Delimiter">.</span>name<span class="Delimiter">);</span>
<span class="Normal">else</span>
offset_value = offset<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>offset_value < <span class="Constant">0</span> || offset_value >= SIZE<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">).</span>elements<span class="Delimiter">))</span> <span class="Delimiter">{</span>
raise << maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> << <span class="Constant">"invalid offset "</span> << offset_value << <span class="Constant">" for "</span> << get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">).</span>name << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
reagent product = 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="Comment">// Update GET product in Check</span>
<span class="Normal">const</span> reagent element = element_type<span class="Delimiter">(</span>base<span class="Delimiter">,</span> offset_value<span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!types_coercible<span class="Delimiter">(</span>product<span class="Delimiter">,</span> element<span class="Delimiter">))</span> <span class="Delimiter">{</span>
raise << maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> << <span class="Constant">"'get "</span> << base<span class="Delimiter">.</span>original_string << <span class="Constant">", "</span> << offset<span class="Delimiter">.</span>original_string << <span class="Constant">"' should write to "</span> << names_to_string_without_quotes<span class="Delimiter">(</span>element<span class="Delimiter">.</span>type<span class="Delimiter">)</span> << <span class="Constant">" but "</span> << product<span class="Delimiter">.</span>name << <span class="Constant">" has type "</span> << names_to_string_without_quotes<span class="Delimiter">(</span>product<span class="Delimiter">.</span>type<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(before "End Primitive Recipe Implementations")</span>
<span class="Normal">case</span> GET: <span class="Delimiter">{</span>
reagent base = 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>
<span class="Comment">// Update GET base in Run</span>
<span class="Normal">int</span> base_address = base<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>base_address == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << maybe<span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> << <span class="Constant">"tried to access location 0 in '"</span> << to_original_string<span class="Delimiter">(</span>current_instruction<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">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
type_ordinal base_type = base<span class="Delimiter">.</span>type<span class="Delimiter">-></span>value<span class="Delimiter">;</span>
<span class="Normal">int</span> offset = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>offset < <span class="Constant">0</span> || offset >= SIZE<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">).</span>elements<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span> <span class="Comment">// copied from Check above</span>
<span class="Normal">int</span> src = base_address<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 < offset<span class="Delimiter">;</span> ++i<span class="Delimiter">)</span>
src += size_of<span class="Delimiter">(</span>element_type<span class="Delimiter">(</span>base<span class="Delimiter">,</span> i<span class="Delimiter">));</span>
trace<span class="Delimiter">(</span><span class="Constant">9998</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"address to copy is "</span> << src << end<span class="Delimiter">();</span>
reagent element = element_type<span class="Delimiter">(</span>base<span class="Delimiter">,</span> offset<span class="Delimiter">);</span>
element<span class="Delimiter">.</span>set_value<span class="Delimiter">(</span>src<span class="Delimiter">);</span>
trace<span class="Delimiter">(</span><span class="Constant">9998</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"its type is "</span> << names_to_string<span class="Delimiter">(</span>element<span class="Delimiter">.</span>type<span class="Delimiter">)</span> << end<span class="Delimiter">();</span>
<span class="Comment">// Read element</span>
products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>read_memory<span class="Delimiter">(</span>element<span class="Delimiter">));</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(code)</span>
<span class="Normal">const</span> reagent element_type<span class="Delimiter">(</span><span class="Normal">const</span> reagent& base<span class="Delimiter">,</span> <span class="Normal">int</span> offset_value<span class="Delimiter">)</span> <span class="Delimiter">{</span>
assert<span class="Delimiter">(</span>offset_value >= <span class="Constant">0</span><span class="Delimiter">);</span>
assert<span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base<span class="Delimiter">.</span>type<span class="Delimiter">-></span>value<span class="Delimiter">));</span>
assert<span class="Delimiter">(</span>!get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base<span class="Delimiter">.</span>type<span class="Delimiter">-></span>value<span class="Delimiter">).</span>name<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
<span class="Normal">const</span> type_info& info = get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base<span class="Delimiter">.</span>type<span class="Delimiter">-></span>value<span class="Delimiter">);</span>
assert<span class="Delimiter">(</span>info<span class="Delimiter">.</span>kind == CONTAINER<span class="Delimiter">);</span>
reagent element = info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>offset_value<span class="Delimiter">);</span>
<span class="Comment">// End element_type Special-cases</span>
<span class="Identifier">return</span> element<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(scenario get_handles_nested_container_elements)</span>
def main [
<span class="Constant">12</span>:number<span class="Special"> <- </span>copy <span class="Constant">34</span>
<span class="Constant">13</span>:number<span class="Special"> <- </span>copy <span class="Constant">35</span>
<span class="Constant">14</span>:number<span class="Special"> <- </span>copy <span class="Constant">36</span>
<span class="Constant">15</span>:number<span class="Special"> <- </span>get <span class="Constant">12</span>:point-number/<span class="Special">raw</span><span class="Delimiter">,</span> <span class="Constant">1</span>:offset <span class="Comment"># unsafe</span>
]
<span class="traceContains">+mem: storing 36 in location 15</span>
<span class="Delimiter">:(scenario get_out_of_bounds)</span>
<span class="Special">% Hide_errors = true;</span>
def main [
<span class="Constant">12</span>:number<span class="Special"> <- </span>copy <span class="Constant">34</span>
<span class="Constant">13</span>:number<span class="Special"> <- </span>copy <span class="Constant">35</span>
<span class="Constant">14</span>:number<span class="Special"> <- </span>copy <span class="Constant">36</span>
get <span class="Constant">12</span>:point-number/<span class="Special">raw</span><span class="Delimiter">,</span> <span class="Constant">2</span>:offset <span class="Comment"># point-number occupies 3 locations but has only 2 fields; out of bounds</span>
]
<span class="traceContains">+error: main: invalid offset 2 for point-number</span>
<span class="Delimiter">:(scenario get_out_of_bounds_2)</span>
<span class="Special">% Hide_errors = true;</span>
def main [
<span class="Constant">12</span>:number<span class="Special"> <- </span>copy <span class="Constant">34</span>
<span class="Constant">13</span>:number<span class="Special"> <- </span>copy <span class="Constant">35</span>
<span class="Constant">14</span>:number<span class="Special"> <- </span>copy <span class="Constant">36</span>
get <span class="Constant">12</span>:point-number/<span class="Special">raw</span><span class="Delimiter">,</span> -<span class="Constant">1</span>:offset
]
<span class="traceContains">+error: main: invalid offset -1 for point-number</span>
<span class="Delimiter">:(scenario get_product_type_mismatch)</span>
<span class="Special">% Hide_errors = true;</span>
def main [
<span class="Constant">12</span>:number<span class="Special"> <- </span>copy <span class="Constant">34</span>
<span class="Constant">13</span>:number<span class="Special"> <- </span>copy <span class="Constant">35</span>
<span class="Constant">14</span>:number<span class="Special"> <- </span>copy <span class="Constant">36</span>
<span class="Constant">15</span>:address:number<span class="Special"> <- </span>get <span class="Constant">12</span>:point-number/<span class="Special">raw</span><span class="Delimiter">,</span> <span class="Constant">1</span>:offset
]
<span class="traceContains">+error: main: 'get 12:point-number/raw, 1:offset' should write to number but 15 has type (address number)</span>
<span class="Comment">//: we might want to call 'get' without saving the results, say in a sandbox</span>
<span class="Delimiter">:(scenario get_without_product)</span>
def main [
<span class="Constant">12</span>:number<span class="Special"> <- </span>copy <span class="Constant">34</span>
<span class="Constant">13</span>:number<span class="Special"> <- </span>copy <span class="Constant">35</span>
get <span class="Constant">12</span>:point/<span class="Special">raw</span><span class="Delimiter">,</span> <span class="Constant">1</span>:offset <span class="Comment"># unsafe</span>
]
<span class="Comment"># just don't die</span>
<span class="SalientComment">//:: To write to elements of containers, use 'put'.</span>
<span class="Delimiter">:(scenario put)</span>
def main [
<span class="Constant">12</span>:number<span class="Special"> <- </span>copy <span class="Constant">34</span>
<span class="Constant">13</span>:number<span class="Special"> <- </span>copy <span class="Constant">35</span>
$clear-trace
<span class="Constant">12</span>:point<span class="Special"> <- </span>put <span class="Constant">12</span>:point<span class="Delimiter">,</span> <span class="Constant">1</span>:offset<span class="Delimiter">,</span> <span class="Constant">36</span>
]
<span class="traceContains">+mem: storing 36 in location 13</span>
<span class="traceAbsent">-mem: storing 34 in location 12</span>
<span class="Delimiter">:(before "End Primitive Recipe Declarations")</span>
PUT<span class="Delimiter">,</span>
<span class="Delimiter">:(before "End Primitive Recipe Numbers")</span>
put<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">"put"</span><span class="Delimiter">,</span> PUT<span class="Delimiter">);</span>
<span class="Delimiter">:(before "End Primitive Recipe Checks")</span>
<span class="Normal">case</span> PUT: <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">3</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> << <span class="Constant">"'put' expects exactly 3 ingredients in '"</span> << to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
reagent base = inst<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="Comment">// Update PUT base in Check</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!base<span class="Delimiter">.</span>type || !base<span class="Delimiter">.</span>type<span class="Delimiter">-></span>value || !contains_key<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base<span class="Delimiter">.</span>type<span class="Delimiter">-></span>value<span class="Delimiter">)</span> || get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base<span class="Delimiter">.</span>type<span class="Delimiter">-></span>value<span class="Delimiter">).</span>kind != CONTAINER<span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> << <span class="Constant">"first ingredient of 'put' should be a container, but got "</span> << inst<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> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
type_ordinal base_type = base<span class="Delimiter">.</span>type<span class="Delimiter">-></span>value<span class="Delimiter">;</span>
reagent offset = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
<span class="Comment">// Update PUT offset in Check</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!is_literal<span class="Delimiter">(</span>offset<span class="Delimiter">)</span> || !is_mu_scalar<span class="Delimiter">(</span>offset<span class="Delimiter">))</span> <span class="Delimiter">{</span>
raise << maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> << <span class="Constant">"second ingredient of 'put' should have type 'offset', but got "</span> << inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Normal">int</span> offset_value = <span class="Constant">0</span><span class="Delimiter">;</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>is_integer<span class="Delimiter">(</span>offset<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span> <span class="Comment">// later layers permit non-integer offsets</span>
offset_value = to_integer<span class="Delimiter">(</span>offset<span class="Delimiter">.</span>name<span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>offset_value < <span class="Constant">0</span> || offset_value >= SIZE<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">).</span>elements<span class="Delimiter">))</span> <span class="Delimiter">{</span>
raise << maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> << <span class="Constant">"invalid offset "</span> << offset_value << <span class="Constant">" for "</span> << get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">).</span>name << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</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>
offset_value = offset<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
reagent& value = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">);</span>
reagent element = element_type<span class="Delimiter">(</span>base<span class="Delimiter">,</span> offset_value<span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!types_coercible<span class="Delimiter">(</span>element<span class="Delimiter">,</span> value<span class="Delimiter">))</span> <span class="Delimiter">{</span>
raise << maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> << <span class="Constant">"'put "</span> << base<span class="Delimiter">.</span>original_string << <span class="Constant">", "</span> << offset<span class="Delimiter">.</span>original_string << <span class="Constant">"' should store "</span> << names_to_string_without_quotes<span class="Delimiter">(</span>element<span class="Delimiter">.</span>type<span class="Delimiter">)</span> << <span class="Constant">" but "</span> << value<span class="Delimiter">.</span>name << <span class="Constant">" has type "</span> << names_to_string_without_quotes<span class="Delimiter">(</span>value<span class="Delimiter">.</span>type<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(before "End Primitive Recipe Implementations")</span>
<span class="Normal">case</span> PUT: <span class="Delimiter">{</span>
reagent base = 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>
<span class="Comment">// Update PUT base in Run</span>
<span class="Normal">int</span> base_address = base<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>base_address == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << maybe<span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> << <span class="Constant">"tried to access location 0 in '"</span> << to_original_string<span class="Delimiter">(</span>current_instruction<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">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
type_ordinal base_type = base<span class="Delimiter">.</span>type<span class="Delimiter">-></span>value<span class="Delimiter">;</span>
<span class="Normal">int</span> offset = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>offset < <span class="Constant">0</span> || offset >= SIZE<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">).</span>elements<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span> <span class="Comment">// copied from Check above</span>
<span class="Normal">int</span> address = base_address<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 < offset<span class="Delimiter">;</span> ++i<span class="Delimiter">)</span>
address += size_of<span class="Delimiter">(</span>element_type<span class="Delimiter">(</span>base<span class="Delimiter">,</span> i<span class="Delimiter">));</span>
trace<span class="Delimiter">(</span><span class="Constant">9998</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"address to copy to is "</span> << address << end<span class="Delimiter">();</span>
<span class="Comment">// optimization: directly write the element rather than updating 'product'</span>
<span class="Comment">// and writing the entire container</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>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">));</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
trace<span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">"mem"</span><span class="Delimiter">)</span> << <span class="Constant">"storing "</span> << no_scientific<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> << <span class="Constant">" in location "</span> << address+i << end<span class="Delimiter">();</span>
put<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> address+i<span class="Delimiter">,</span> ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
<span class="Delimiter">}</span>
<span class="Identifier">goto</span> finish_instruction<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="SalientComment">//:: Allow containers to be defined in mu code.</span>
<span class="Delimiter">:(scenarios load)</span>
<span class="Delimiter">:(scenario container)</span>
container foo [
<span class="Normal">x</span>:number
<span class="Normal">y</span>:number
]
<span class="traceContains">+parse: --- defining container foo</span>
<span class="traceContains">+parse: element: {x: "number"}</span>
<span class="traceContains">+parse: element: {y: "number"}</span>
<span class="Delimiter">:(scenario container_use_before_definition)</span>
container foo [
<span class="Normal">x</span>:number
<span class="Normal">y</span>:bar
]
container bar [
<span class="Normal">x</span>:number
<span class="Normal">y</span>:number
]
<span class="traceContains">+parse: --- defining container foo</span>
<span class="traceContains">+parse: type number: 1000</span>
<span class="traceContains">+parse: element: {x: "number"}</span>
<span class="Comment"># todo: brittle</span>
<span class="Comment"># type bar is unknown at this point, but we assign it a number</span>
<span class="traceContains">+parse: element: {y: "bar"}</span>
<span class="Comment"># later type bar geon</span>
<span class="traceContains">+parse: --- defining container bar</span>
<span class="traceContains">+parse: type number: 1001</span>
<span class="traceContains">+parse: element: {x: "number"}</span>
<span class="traceContains">+parse: element: {y: "number"}</span>
<span class="Delimiter">:(before "End Command Handlers")</span>
<span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>command == <span class="Constant">"container"</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
insert_container<span class="Delimiter">(</span>command<span class="Delimiter">,</span> CONTAINER<span class="Delimiter">,</span> in<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(code)</span>
<span class="Normal">void</span> insert_container<span class="Delimiter">(</span><span class="Normal">const</span> string& command<span class="Delimiter">,</span> kind_of_type kind<span class="Delimiter">,</span> istream& in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
skip_whitespace_but_not_newline<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
string name = next_word<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span class="Comment">// End container Name Refinements</span>
trace<span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">"parse"</span><span class="Delimiter">)</span> << <span class="Constant">"--- defining "</span> << command << <span class="Constant">' '</span> << name << end<span class="Delimiter">();</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> name<span class="Delimiter">)</span>
|| get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> name<span class="Delimiter">)</span> == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
put<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> name<span class="Delimiter">,</span> Next_type_ordinal++<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
trace<span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">"parse"</span><span class="Delimiter">)</span> << <span class="Constant">"type number: "</span> << get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> name<span class="Delimiter">)</span> << end<span class="Delimiter">();</span>
skip_bracket<span class="Delimiter">(</span>in<span class="Delimiter">,</span> <span class="Constant">"'container' must begin with '['"</span><span class="Delimiter">);</span>
type_info& info = get_or_insert<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> name<span class="Delimiter">));</span>
info<span class="Delimiter">.</span>name = name<span class="Delimiter">;</span>
info<span class="Delimiter">.</span>kind = kind<span class="Delimiter">;</span>
<span class="Normal">while</span> <span class="Delimiter">(</span>has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
skip_whitespace_and_comments<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
string element = next_word<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>element == <span class="Constant">"]"</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>reagent<span class="Delimiter">(</span>element<span class="Delimiter">));</span>
replace_unknown_types_with_unique_ordinals<span class="Delimiter">(</span>info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>back<span class="Delimiter">().</span>type<span class="Delimiter">,</span> info<span class="Delimiter">);</span>
trace<span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">"parse"</span><span class="Delimiter">)</span> << <span class="Constant">" element: "</span> << to_string<span class="Delimiter">(</span>info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>back<span class="Delimiter">())</span> << end<span class="Delimiter">();</span>
<span class="Comment">// End Load Container Element Definition</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Normal">void</span> replace_unknown_types_with_unique_ordinals<span class="Delimiter">(</span>type_tree* type<span class="Delimiter">,</span> <span class="Normal">const</span> type_info& info<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">-></span>name<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type<span class="Delimiter">-></span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span>
type<span class="Delimiter">-></span>value = get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type<span class="Delimiter">-></span>name<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_integer<span class="Delimiter">(</span>type<span class="Delimiter">-></span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span> <span class="Comment">// sometimes types will contain non-type tags, like numbers for the size of an array</span>
type<span class="Delimiter">-></span>value = <span class="Constant">0</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Comment">// End insert_container Special-cases</span>
<span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-></span>name != <span class="Constant">"->"</span><span class="Delimiter">)</span> <span class="Delimiter">{</span> <span class="Comment">// used in recipe types</span>
put<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type<span class="Delimiter">-></span>name<span class="Delimiter">,</span> Next_type_ordinal++<span class="Delimiter">);</span>
type<span class="Delimiter">-></span>value = get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type<span class="Delimiter">-></span>name<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
replace_unknown_types_with_unique_ordinals<span class="Delimiter">(</span>type<span class="Delimiter">-></span>left<span class="Delimiter">,</span> info<span class="Delimiter">);</span>
replace_unknown_types_with_unique_ordinals<span class="Delimiter">(</span>type<span class="Delimiter">-></span>right<span class="Delimiter">,</span> info<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Normal">void</span> skip_bracket<span class="Delimiter">(</span>istream& in<span class="Delimiter">,</span> string message<span class="Delimiter">)</span> <span class="Delimiter">{</span>
skip_whitespace_and_comments<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>get<span class="Delimiter">()</span> != <span class="Constant">'['</span><span class="Delimiter">)</span>
raise << message << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(scenarios run)</span>
<span class="Delimiter">:(scenario container_define_twice)</span>
container foo [
<span class="Normal">x</span>:number
]
container foo [
<span class="Normal">y</span>:number
]
def main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">34</span>
<span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">35</span>
<span class="Constant">3</span>:number<span class="Special"> <- </span>get <span class="Constant">1</span>:foo<span class="Delimiter">,</span> <span class="Constant">0</span>:offset
<span class="Constant">4</span>:number<span class="Special"> <- </span>get <span class="Constant">1</span>:foo<span class="Delimiter">,</span> <span class="Constant">1</span>:offset
]
<span class="traceContains">+mem: storing 34 in location 3</span>
<span class="traceContains">+mem: storing 35 in location 4</span>
<span class="Comment">//: ensure scenarios are consistent by always starting them at the same type</span>
<span class="Comment">//: number.</span>
<span class="Delimiter">:(before "End Setup")</span> <span class="Comment">//: for tests</span>
Next_type_ordinal = <span class="Constant">1000</span><span class="Delimiter">;</span>
<span class="Delimiter">:(before "End Test Run Initialization")</span>
assert<span class="Delimiter">(</span>Next_type_ordinal < <span class="Constant">1000</span><span class="Delimiter">);</span>
<span class="SalientComment">//:: Allow container definitions anywhere in the codebase, but complain if you</span>
<span class="SalientComment">//:: can't find a definition at the end.</span>
<span class="Delimiter">:(scenario run_complains_on_unknown_types)</span>
<span class="Special">% Hide_errors = true;</span>
def main [
<span class="Comment"># integer is not a type</span>
<span class="Constant">1</span>:integer<span class="Special"> <- </span>copy <span class="Constant">0</span>
]
<span class="traceContains">+error: main: unknown type integer in '1:integer <- copy 0'</span>
<span class="Delimiter">:(scenario run_allows_type_definition_after_use)</span>
def main [
<span class="Constant">1</span>:bar<span class="Special"> <- </span>copy <span class="Constant">0</span>/unsafe
]
container bar [
<span class="Normal">x</span>:number
]
$error: <span class="Constant">0</span>
<span class="Delimiter">:(after "Begin Instruction Modifying Transforms")</span>
<span class="Comment">// Begin Type Modifying Transforms</span>
Transform<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>check_or_set_invalid_types<span class="Delimiter">);</span> <span class="Comment">// idempotent</span>
<span class="Comment">// End Type Modifying Transforms</span>
<span class="Delimiter">:(code)</span>
<span class="Normal">void</span> check_or_set_invalid_types<span class="Delimiter">(</span><span class="Normal">const</span> recipe_ordinal r<span class="Delimiter">)</span> <span class="Delimiter">{</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 for invalid types in recipe "</span> << caller<span class="Delimiter">.</span>name << end<span class="Delimiter">();</span>
<span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> index = <span class="Constant">0</span><span class="Delimiter">;</span> index < SIZE<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>steps<span class="Delimiter">);</span> ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
instruction& inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<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>
check_or_set_invalid_types<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">,</span> maybe<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">),</span> <span class="Constant">"'"</span>+to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span>+<span class="Constant">"'"</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>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span>
check_or_set_invalid_types<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">,</span> maybe<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">),</span> <span class="Constant">"'"</span>+to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span>+<span class="Constant">"'"</span><span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Comment">// End check_or_set_invalid_types</span>
<span class="Delimiter">}</span>
<span class="Normal">void</span> check_or_set_invalid_types<span class="Delimiter">(</span>type_tree* type<span class="Delimiter">,</span> <span class="Normal">const</span> string& block<span class="Delimiter">,</span> <span class="Normal">const</span> string& name<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span> <span class="Comment">// will throw a more precise error elsewhere</span>
<span class="Comment">// End Container Type Checks</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-></span>value == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> type<span class="Delimiter">-></span>value<span class="Delimiter">))</span> <span class="Delimiter">{</span>
assert<span class="Delimiter">(</span>!type<span class="Delimiter">-></span>name<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type<span class="Delimiter">-></span>name<span class="Delimiter">))</span>
type<span class="Delimiter">-></span>value = get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type<span class="Delimiter">-></span>name<span class="Delimiter">);</span>
<span class="Normal">else</span>
raise << block << <span class="Constant">"unknown type "</span> << type<span class="Delimiter">-></span>name << <span class="Constant">" in "</span> << name << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Delimiter">}</span>
check_or_set_invalid_types<span class="Delimiter">(</span>type<span class="Delimiter">-></span>left<span class="Delimiter">,</span> block<span class="Delimiter">,</span> name<span class="Delimiter">);</span>
check_or_set_invalid_types<span class="Delimiter">(</span>type<span class="Delimiter">-></span>right<span class="Delimiter">,</span> block<span class="Delimiter">,</span> name<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(scenario container_unknown_field)</span>
<span class="Special">% Hide_errors = true;</span>
container foo [
<span class="Normal">x</span>:number
<span class="Normal">y</span>:bar
]
<span class="traceContains">+error: foo: unknown type in y</span>
<span class="Delimiter">:(scenario read_container_with_bracket_in_comment)</span>
container foo [
<span class="Normal">x</span>:number
<span class="Comment"># ']' in comment</span>
<span class="Normal">y</span>:number
]
<span class="traceContains">+parse: --- defining container foo</span>
<span class="traceContains">+parse: element: {x: "number"}</span>
<span class="traceContains">+parse: element: {y: "number"}</span>
<span class="Delimiter">:(before "End transform_all")</span>
check_container_field_types<span class="Delimiter">();</span>
<span class="Delimiter">:(code)</span>
<span class="Normal">void</span> check_container_field_types<span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span class="Normal">for</span> <span class="Delimiter">(</span>map<type_ordinal<span class="Delimiter">,</span> type_info>::iterator p = Type<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != Type<span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">const</span> type_info& info = p<span class="Delimiter">-></span>second<span class="Delimiter">;</span>
<span class="Comment">// Check Container Field Types(info)</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>info<span class="Delimiter">.</span>elements<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span>
check_invalid_types<span class="Delimiter">(</span>info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">,</span> maybe<span class="Delimiter">(</span>info<span class="Delimiter">.</span>name<span class="Delimiter">),</span> info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Normal">void</span> check_invalid_types<span class="Delimiter">(</span><span class="Normal">const</span> type_tree* type<span class="Delimiter">,</span> <span class="Normal">const</span> string& block<span class="Delimiter">,</span> <span class="Normal">const</span> string& name<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span> <span class="Comment">// will throw a more precise error elsewhere</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-></span>value == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
assert<span class="Delimiter">(</span>!type<span class="Delimiter">-></span>left && !type<span class="Delimiter">-></span>right<span class="Delimiter">);</span>
<span class="Identifier">return</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> type<span class="Delimiter">-></span>value<span class="Delimiter">))</span>
raise << block << <span class="Constant">"unknown type in "</span> << name << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
check_invalid_types<span class="Delimiter">(</span>type<span class="Delimiter">-></span>left<span class="Delimiter">,</span> block<span class="Delimiter">,</span> name<span class="Delimiter">);</span>
check_invalid_types<span class="Delimiter">(</span>type<span class="Delimiter">-></span>right<span class="Delimiter">,</span> block<span class="Delimiter">,</span> name<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="SalientComment">//:: Construct types out of their constituent fields.</span>
<span class="Delimiter">:(scenario merge)</span>
container foo [
<span class="Normal">x</span>:number
<span class="Normal">y</span>:number
]
def main [
<span class="Constant">1</span>:foo<span class="Special"> <- </span>merge <span class="Constant">3</span><span class="Delimiter">,</span> <span class="Constant">4</span>
]
<span class="traceContains">+mem: storing 3 in location 1</span>
<span class="traceContains">+mem: storing 4 in location 2</span>
<span class="Delimiter">:(before "End Primitive Recipe Declarations")</span>
MERGE<span class="Delimiter">,</span>
<span class="Delimiter">:(before "End Primitive Recipe Numbers")</span>
put<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">"merge"</span><span class="Delimiter">,</span> MERGE<span class="Delimiter">);</span>
<span class="Delimiter">:(before "End Primitive Recipe Checks")</span>
<span class="Normal">case</span> MERGE: <span class="Delimiter">{</span>
<span class="Comment">// type-checking in a separate transform below</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(before "End Primitive Recipe Implementations")</span>
<span class="Normal">case</span> MERGE: <span class="Delimiter">{</span>
products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</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>ingredients<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span>
<span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Constant">0</span><span class="Delimiter">;</span> j < SIZE<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span> ++j<span class="Delimiter">)</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>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span>j<span class="Delimiter">));</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Comment">//: type-check 'merge' to avoid interpreting numbers as addresses</span>
<span class="Delimiter">:(scenario merge_check)</span>
def main [
<span class="Constant">1</span>:point<span class="Special"> <- </span>merge <span class="Constant">3</span><span class="Delimiter">,</span> <span class="Constant">4</span>
]
$error: <span class="Constant">0</span>
<span class="Delimiter">:(scenario merge_check_missing_element)</span>
<span class="Special">% Hide_errors = true;</span>
def main [
<span class="Constant">1</span>:point<span class="Special"> <- </span>merge <span class="Constant">3</span>
]
<span class="traceContains">+error: main: too few ingredients in '1:point <- merge 3'</span>
<span class="Delimiter">:(scenario merge_check_extra_element)</span>
<span class="Special">% Hide_errors = true;</span>
def main [
<span class="Constant">1</span>:point<span class="Special"> <- </span>merge <span class="Constant">3</span><span class="Delimiter">,</span> <span class="Constant">4</span><span class="Delimiter">,</span> <span class="Constant">5</span>
]
<span class="traceContains">+error: main: too many ingredients in '1:point <- merge 3, 4, 5'</span>
<span class="Comment">//: We want to avoid causing memory corruption, but other than that we want to</span>
<span class="Comment">//: be flexible in how we construct containers of containers. It should be</span>
<span class="Comment">//: equally easy to define a container out of primitives or intermediate</span>
<span class="Comment">//: container fields.</span>
<span class="Delimiter">:(scenario merge_check_recursive_containers)</span>
def main [
<span class="Constant">1</span>:point<span class="Special"> <- </span>merge <span class="Constant">3</span><span class="Delimiter">,</span> <span class="Constant">4</span>
<span class="Constant">1</span>:point-number<span class="Special"> <- </span>merge <span class="Constant">1</span>:point<span class="Delimiter">,</span> <span class="Constant">5</span>
]
$error: <span class="Constant">0</span>
<span class="Delimiter">:(scenario merge_check_recursive_containers_2)</span>
<span class="Special">% Hide_errors = true;</span>
def main [
<span class="Constant">1</span>:point<span class="Special"> <- </span>merge <span class="Constant">3</span><span class="Delimiter">,</span> <span class="Constant">4</span>
<span class="Constant">2</span>:point-number<span class="Special"> <- </span>merge <span class="Constant">1</span>:point
]
<span class="traceContains">+error: main: too few ingredients in '2:point-number <- merge 1:point'</span>
<span class="Delimiter">:(scenario merge_check_recursive_containers_3)</span>
def main [
<span class="Constant">1</span>:point-number<span class="Special"> <- </span>merge <span class="Constant">3</span><span class="Delimiter">,</span> <span class="Constant">4</span><span class="Delimiter">,</span> <span class="Constant">5</span>
]
$error: <span class="Constant">0</span>
<span class="Delimiter">:(scenario merge_check_recursive_containers_4)</span>
<span class="Special">% Hide_errors = true;</span>
def main [
<span class="Constant">1</span>:point-number<span class="Special"> <- </span>merge <span class="Constant">3</span><span class="Delimiter">,</span> <span class="Constant">4</span>
]
<span class="traceContains">+error: main: too few ingredients in '1:point-number <- merge 3, 4'</span>
<span class="Delimiter">:(scenario merge_check_reflexive)</span>
<span class="Special">% Hide_errors = true;</span>
def main [
<span class="Constant">1</span>:point<span class="Special"> <- </span>merge <span class="Constant">3</span><span class="Delimiter">,</span> <span class="Constant">4</span>
<span class="Constant">2</span>:point<span class="Special"> <- </span>merge <span class="Constant">1</span>:point
]
$error: <span class="Constant">0</span>
<span class="Comment">//: Since a container can be merged in several ways, we need to be able to</span>
<span class="Comment">//: backtrack through different possibilities. Later we'll allow creating</span>
<span class="Comment">//: exclusive containers which contain just one of rather than all of their</span>
<span class="Comment">//: elements. That will also require backtracking capabilities. Here's the</span>
<span class="Comment">//: state we need to maintain for backtracking:</span>
<span class="Delimiter">:(before "End Types")</span>
<span class="Normal">struct</span> merge_check_point <span class="Delimiter">{</span>
reagent container<span class="Delimiter">;</span>
<span class="Normal">int</span> container_element_index<span class="Delimiter">;</span>
merge_check_point<span class="Delimiter">(</span><span class="Normal">const</span> reagent& c<span class="Delimiter">,</span> <span class="Normal">int</span> i<span class="Delimiter">)</span> :container<span class="Delimiter">(</span>c<span class="Delimiter">),</span> container_element_index<span class="Delimiter">(</span>i<span class="Delimiter">)</span> <span class="Delimiter">{}</span>
<span class="Delimiter">};</span>
<span class="Normal">struct</span> merge_check_state <span class="Delimiter">{</span>
stack<merge_check_point> data<span class="Delimiter">;</span>
<span class="Delimiter">};</span>
<span class="Delimiter">:(before "End Checks")</span>
Transform<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>check_merge_calls<span class="Delimiter">);</span>
<span class="Delimiter">:(code)</span>
<span class="Normal">void</span> check_merge_calls<span class="Delimiter">(</span><span class="Normal">const</span> recipe_ordinal r<span class="Delimiter">)</span> <span class="Delimiter">{</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">"--- type-check merge instructions in recipe "</span> << caller<span class="Delimiter">.</span>name << end<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>
<span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name != <span class="Constant">"merge"</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> != <span class="Constant">1</span><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">"'merge' should yield a single product in '"</span> << to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">continue</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
reagent product = 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="Comment">// Update product While Type-checking Merge</span>
type_ordinal product_type = product<span class="Delimiter">.</span>type<span class="Delimiter">-></span>value<span class="Delimiter">;</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>product_type == <span class="Constant">0</span> || !contains_key<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> product_type<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">"'merge' should yield a container in '"</span> << to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">continue</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Normal">const</span> type_info& info = get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> product_type<span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>info<span class="Delimiter">.</span>kind != CONTAINER && info<span class="Delimiter">.</span>kind != EXCLUSIVE_CONTAINER<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">"'merge' should yield a container in '"</span> << to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">continue</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
check_merge_call<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">,</span> product<span class="Delimiter">,</span> caller<span class="Delimiter">,</span> inst<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Normal">void</span> check_merge_call<span class="Delimiter">(</span><span class="Normal">const</span> vector<reagent>& ingredients<span class="Delimiter">,</span> <span class="Normal">const</span> reagent& product<span class="Delimiter">,</span> <span class="Normal">const</span> recipe& caller<span class="Delimiter">,</span> <span class="Normal">const</span> instruction& inst<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">int</span> ingredient_index = <span class="Constant">0</span><span class="Delimiter">;</span>
merge_check_state state<span class="Delimiter">;</span>
state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>push<span class="Delimiter">(</span>merge_check_point<span class="Delimiter">(</span>product<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">));</span>
<span class="Normal">while</span> <span class="Delimiter">(</span><span class="Constant">true</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
assert<span class="Delimiter">(</span>!state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
trace<span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">"transform"</span><span class="Delimiter">)</span> << ingredient_index << <span class="Constant">" vs "</span> << SIZE<span class="Delimiter">(</span>ingredients<span class="Delimiter">)</span> << end<span class="Delimiter">();</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>ingredient_index >= SIZE<span class="Delimiter">(</span>ingredients<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">"too few ingredients in '"</span> << to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">return</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
reagent& container = state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container<span class="Delimiter">;</span>
type_info& container_info = get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> container<span class="Delimiter">.</span>type<span class="Delimiter">-></span>value<span class="Delimiter">);</span>
<span class="Normal">switch</span> <span class="Delimiter">(</span>container_info<span class="Delimiter">.</span>kind<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">case</span> CONTAINER: <span class="Delimiter">{</span>
<span class="Comment">// degenerate case: merge with the same type always succeeds</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index == <span class="Constant">0</span> && types_coercible<span class="Delimiter">(</span>container<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">)))</span>
<span class="Identifier">return</span><span class="Delimiter">;</span>
reagent expected_ingredient = element_type<span class="Delimiter">(</span>container<span class="Delimiter">,</span> state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index<span class="Delimiter">);</span>
trace<span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">"transform"</span><span class="Delimiter">)</span> << <span class="Constant">"checking container "</span> << to_string<span class="Delimiter">(</span>container<span class="Delimiter">)</span> << <span class="Constant">" || "</span> << to_string<span class="Delimiter">(</span>expected_ingredient<span class="Delimiter">)</span> << <span class="Constant">" vs ingredient "</span> << ingredient_index << end<span class="Delimiter">();</span>
<span class="Comment">// if the current element is the ingredient we expect, move on to the next element/ingredient</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>types_coercible<span class="Delimiter">(</span>expected_ingredient<span class="Delimiter">,</span> ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
++ingredient_index<span class="Delimiter">;</span>
++state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index<span class="Delimiter">;</span>
<span class="Normal">while</span> <span class="Delimiter">(</span>state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index >= SIZE<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container<span class="Delimiter">.</span>type<span class="Delimiter">-></span>value<span class="Delimiter">).</span>elements<span class="Delimiter">))</span> <span class="Delimiter">{</span>
state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>pop<span class="Delimiter">();</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>ingredient_index < SIZE<span class="Delimiter">(</span>ingredients<span class="Delimiter">))</span>
raise << maybe<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"too many ingredients in '"</span> << to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">return</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
++state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Comment">// if not, maybe it's a field of the current element</span>
<span class="Normal">else</span> <span class="Delimiter">{</span>
<span class="Comment">// no change to ingredient_index</span>
state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>push<span class="Delimiter">(</span>merge_check_point<span class="Delimiter">(</span>expected_ingredient<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="Delimiter">}</span>
<span class="Comment">// End valid_merge Cases</span>
<span class="Normal">default</span>: <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!types_coercible<span class="Delimiter">(</span>container<span class="Delimiter">,</span> ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<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">"incorrect type of ingredient "</span> << ingredient_index << <span class="Constant">" in '"</span> << to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
raise << <span class="Constant">" (expected "</span> << debug_string<span class="Delimiter">(</span>container<span class="Delimiter">)</span> << <span class="Constant">")</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
raise << <span class="Constant">" (got "</span> << debug_string<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<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">return</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
++ingredient_index<span class="Delimiter">;</span>
<span class="Comment">// ++state.data.top().container_element_index; // unnecessary, but wouldn't do any harm</span>
<span class="Normal">do</span> <span class="Delimiter">{</span>
state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>pop<span class="Delimiter">();</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>ingredient_index < SIZE<span class="Delimiter">(</span>ingredients<span class="Delimiter">))</span>
raise << maybe<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"too many ingredients in '"</span> << to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">return</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
++state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index<span class="Delimiter">;</span>
<span class="Delimiter">}</span> <span class="Normal">while</span> <span class="Delimiter">(</span>state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index >= SIZE<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container<span class="Delimiter">.</span>type<span class="Delimiter">-></span>value<span class="Delimiter">).</span>elements<span class="Delimiter">));</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Comment">// never gets here</span>
assert<span class="Delimiter">(</span><span class="Constant">false</span><span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(scenario merge_check_product)</span>
<span class="Special">% Hide_errors = true;</span>
def main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>merge <span class="Constant">3</span>
]
<span class="traceContains">+error: main: 'merge' should yield a container in '1:number <- merge 3'</span>
<span class="Delimiter">:(before "End Includes")</span>
<span class="PreProc">#include </span><span class="Constant"><stack></span>
<span class="Normal">using</span> std::stack<span class="Delimiter">;</span>
</pre>
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