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<span class="Comment">//: Arrays contain a variable number of elements of the same type. Their value</span>
<span class="Comment">//: starts with the length of the array.</span>
<span class="Comment">//:</span>
<span class="Comment">//: You can create arrays of containers, but containers can only contain</span>
<span class="Comment">//: elements of a fixed size, so you can't create containers containing arrays.</span>
<span class="Comment">//: Create containers containing addresses to arrays instead.</span>
<span class="Comment">//: Tests in this layer often explicitly setup memory before reading it as an</span>
<span class="Comment">//: array. Don't do this in general. I'm tagging exceptions with /raw to</span>
<span class="Comment">//: avoid warnings.</span>
<span class="Delimiter">:(scenario copy_array)</span>
<span class="Comment"># Arrays can be copied around with a single instruction just like numbers,</span>
<span class="Comment"># no matter how large they are.</span>
recipe main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">3</span> <span class="Comment"># length</span>
<span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">14</span>
<span class="Constant">3</span>:number<span class="Special"> <- </span>copy <span class="Constant">15</span>
<span class="Constant">4</span>:number<span class="Special"> <- </span>copy <span class="Constant">16</span>
<span class="Constant">5</span>:array:number<span class="Special"> <- </span>copy <span class="Constant">1</span>:array:number/<span class="Special">raw</span> <span class="Comment"># unsafe</span>
]
<span class="traceContains">+mem: storing 3 in location 5</span>
<span class="traceContains">+mem: storing 14 in location 6</span>
<span class="traceContains">+mem: storing 15 in location 7</span>
<span class="traceContains">+mem: storing 16 in location 8</span>
<span class="Delimiter">:(scenario copy_array_indirect)</span>
recipe main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">3</span> <span class="Comment"># length</span>
<span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">14</span>
<span class="Constant">3</span>:number<span class="Special"> <- </span>copy <span class="Constant">15</span>
<span class="Constant">4</span>:number<span class="Special"> <- </span>copy <span class="Constant">16</span>
<span class="Constant">5</span>:address:array:number<span class="Special"> <- </span>copy <span class="Constant">1</span>
<span class="Constant">6</span>:array:number<span class="Special"> <- </span>copy *<span class="Constant">5</span>:address:array:number
]
<span class="traceContains">+mem: storing 3 in location 6</span>
<span class="traceContains">+mem: storing 14 in location 7</span>
<span class="traceContains">+mem: storing 15 in location 8</span>
<span class="traceContains">+mem: storing 16 in location 9</span>
<span class="Comment">//: disable the size mismatch check since the destination array need not be initialized</span>
<span class="Delimiter">:(before "End size_mismatch(x) Cases")</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>x<span class="Delimiter">.</span>types<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> == Type_ordinal[<span class="Constant">"array"</span>]<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Delimiter">:(before "End size_of(reagent) Cases")</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>r<span class="Delimiter">.</span>types<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> == Type_ordinal[<span class="Constant">"array"</span>]<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>r<span class="Delimiter">.</span>types<span class="Delimiter">)</span> == <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << current_recipe_name<span class="Delimiter">()</span> << <span class="Constant">": '"</span> << r<span class="Delimiter">.</span>original_string << <span class="Constant">"' is an array of what?</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">return</span> <span class="Constant">1</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Comment">// skip the 'array' type to get at the element type</span>
<span class="Identifier">return</span> <span class="Constant">1</span> + Memory[r<span class="Delimiter">.</span>value]*size_of<span class="Delimiter">(</span>array_element<span class="Delimiter">(</span>r<span class="Delimiter">.</span>types<span class="Delimiter">));</span>
<span class="Delimiter">}</span>
<span class="SalientComment">//:: To access elements of an array, use 'index'</span>
<span class="Delimiter">:(scenario index)</span>
recipe main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">3</span> <span class="Comment"># length</span>
<span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">14</span>
<span class="Constant">3</span>:number<span class="Special"> <- </span>copy <span class="Constant">15</span>
<span class="Constant">4</span>:number<span class="Special"> <- </span>copy <span class="Constant">16</span>
<span class="Constant">5</span>:number<span class="Special"> <- </span>index <span class="Constant">1</span>:array:number/<span class="Special">raw</span><span class="Delimiter">,</span> <span class="Constant">0</span> <span class="Comment"># unsafe</span>
]
<span class="traceContains">+mem: storing 14 in location 5</span>
<span class="Delimiter">:(scenario index_direct_offset)</span>
recipe main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">3</span> <span class="Comment"># length</span>
<span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">14</span>
<span class="Constant">3</span>:number<span class="Special"> <- </span>copy <span class="Constant">15</span>
<span class="Constant">4</span>:number<span class="Special"> <- </span>copy <span class="Constant">16</span>
<span class="Constant">5</span>:number<span class="Special"> <- </span>copy <span class="Constant">0</span>
<span class="Constant">6</span>:number<span class="Special"> <- </span>index <span class="Constant">1</span>:array:number/<span class="Special">raw</span><span class="Delimiter">,</span> <span class="Constant">5</span>:number <span class="Comment"># unsafe</span>
]
<span class="traceContains">+mem: storing 14 in location 6</span>
<span class="Delimiter">:(before "End Primitive Recipe Declarations")</span>
INDEX<span class="Delimiter">,</span>
<span class="Delimiter">:(before "End Primitive Recipe Numbers")</span>
Recipe_ordinal[<span class="Constant">"index"</span>] = INDEX<span class="Delimiter">;</span>
<span class="Delimiter">:(before "End Primitive Recipe Implementations")</span>
<span class="Normal">case</span> INDEX: <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << current_recipe_name<span class="Delimiter">()</span> << <span class="Constant">": 'index' expects exactly 2 ingredients in '"</span> << current_instruction<span class="Delimiter">().</span>to_string<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 = canonize<span class="Delimiter">(</span>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="Normal">if</span> <span class="Delimiter">(</span>base<span class="Delimiter">.</span>types<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> != Type_ordinal[<span class="Constant">"array"</span>]<span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << current_recipe_name <span class="Delimiter">()</span> << <span class="Constant">": 'index' on a non-array "</span> << base<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">long</span> <span class="Normal">long</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 << current_recipe_name<span class="Delimiter">()</span> << <span class="Constant">": tried to access location 0 in '"</span> << current_instruction<span class="Delimiter">().</span>to_string<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 offset = canonize<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">));</span>
vector<<span class="Normal">double</span>> offset_val<span class="Delimiter">(</span>read_memory<span class="Delimiter">(</span>offset<span class="Delimiter">));</span>
vector<type_ordinal> element_type = array_element<span class="Delimiter">(</span>base<span class="Delimiter">.</span>types<span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>offset_val<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> < <span class="Constant">0</span> || offset_val<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> >= Memory[base_address]<span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << current_recipe_name<span class="Delimiter">()</span> << <span class="Constant">": invalid index "</span> << offset_val<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><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="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> src = base_address + <span class="Constant">1</span> + offset_val<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span>*size_of<span class="Delimiter">(</span>element_type<span class="Delimiter">);</span>
trace<span class="Delimiter">(</span>Primitive_recipe_depth<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>
trace<span class="Delimiter">(</span>Primitive_recipe_depth<span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"its type is "</span> << Type[element_type<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span>]<span class="Delimiter">.</span>name << end<span class="Delimiter">();</span>
reagent tmp<span class="Delimiter">;</span>
tmp<span class="Delimiter">.</span>set_value<span class="Delimiter">(</span>src<span class="Delimiter">);</span>
copy<span class="Delimiter">(</span>element_type<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> element_type<span class="Delimiter">.</span>end<span class="Delimiter">(),</span> inserter<span class="Delimiter">(</span>tmp<span class="Delimiter">.</span>types<span class="Delimiter">,</span> tmp<span class="Delimiter">.</span>types<span class="Delimiter">.</span>begin<span class="Delimiter">()));</span>
products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>read_memory<span class="Delimiter">(</span>tmp<span class="Delimiter">));</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(code)</span>
vector<type_ordinal> array_element<span class="Delimiter">(</span><span class="Normal">const</span> vector<type_ordinal>& types<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Identifier">return</span> vector<type_ordinal><span class="Delimiter">(</span>++types<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> types<span class="Delimiter">.</span>end<span class="Delimiter">());</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(scenario index_indirect)</span>
recipe main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">3</span> <span class="Comment"># length</span>
<span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">14</span>
<span class="Constant">3</span>:number<span class="Special"> <- </span>copy <span class="Constant">15</span>
<span class="Constant">4</span>:number<span class="Special"> <- </span>copy <span class="Constant">16</span>
<span class="Constant">5</span>:address:array:number<span class="Special"> <- </span>copy <span class="Constant">1</span>
<span class="Constant">6</span>:number<span class="Special"> <- </span>index *<span class="Constant">5</span>:address:array:number<span class="Delimiter">,</span> <span class="Constant">1</span>
]
<span class="traceContains">+mem: storing 15 in location 6</span>
<span class="Delimiter">:(scenario index_out_of_bounds)</span>
<span class="Special">% Hide_warnings = true;</span>
recipe main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">3</span> <span class="Comment"># 3 points</span>
<span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">14</span>
<span class="Constant">3</span>:number<span class="Special"> <- </span>copy <span class="Constant">15</span>
<span class="Constant">4</span>:number<span class="Special"> <- </span>copy <span class="Constant">16</span>
<span class="Constant">5</span>:number<span class="Special"> <- </span>copy <span class="Constant">14</span>
<span class="Constant">6</span>:number<span class="Special"> <- </span>copy <span class="Constant">15</span>
<span class="Constant">7</span>:number<span class="Special"> <- </span>copy <span class="Constant">16</span>
<span class="Constant">8</span>:address:array:point<span class="Special"> <- </span>copy <span class="Constant">1</span>
index *<span class="Constant">8</span>:address:array:point<span class="Delimiter">,</span> <span class="Constant">4</span> <span class="Comment"># less than size of array in locations, but larger than its length in elements</span>
]
<span class="traceContains">+warn: main: invalid index 4</span>
<span class="Delimiter">:(scenario index_out_of_bounds2)</span>
<span class="Special">% Hide_warnings = true;</span>
recipe main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">3</span> <span class="Comment"># 3 points</span>
<span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">14</span>
<span class="Constant">3</span>:number<span class="Special"> <- </span>copy <span class="Constant">15</span>
<span class="Constant">4</span>:number<span class="Special"> <- </span>copy <span class="Constant">16</span>
<span class="Constant">5</span>:number<span class="Special"> <- </span>copy <span class="Constant">14</span>
<span class="Constant">6</span>:number<span class="Special"> <- </span>copy <span class="Constant">15</span>
<span class="Constant">7</span>:number<span class="Special"> <- </span>copy <span class="Constant">16</span>
<span class="Constant">8</span>:address:array:point<span class="Special"> <- </span>copy <span class="Constant">1</span>
index *<span class="Constant">8</span>:address:array:point<span class="Delimiter">,</span> -<span class="Constant">1</span>
]
<span class="traceContains">+warn: main: invalid index -1</span>
<span class="SalientComment">//:: To write to elements of containers, you need their address.</span>
<span class="Delimiter">:(scenario index_address)</span>
recipe main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">3</span> <span class="Comment"># length</span>
<span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">14</span>
<span class="Constant">3</span>:number<span class="Special"> <- </span>copy <span class="Constant">15</span>
<span class="Constant">4</span>:number<span class="Special"> <- </span>copy <span class="Constant">16</span>
<span class="Constant">5</span>:number<span class="Special"> <- </span>index-address <span class="Constant">1</span>:array:number/<span class="Special">raw</span><span class="Delimiter">,</span> <span class="Constant">0</span> <span class="Comment"># unsafe</span>
]
<span class="traceContains">+mem: storing 2 in location 5</span>
<span class="Delimiter">:(before "End Primitive Recipe Declarations")</span>
INDEX_ADDRESS<span class="Delimiter">,</span>
<span class="Delimiter">:(before "End Primitive Recipe Numbers")</span>
Recipe_ordinal[<span class="Constant">"index-address"</span>] = INDEX_ADDRESS<span class="Delimiter">;</span>
<span class="Delimiter">:(before "End Primitive Recipe Implementations")</span>
<span class="Normal">case</span> INDEX_ADDRESS: <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << current_recipe_name<span class="Delimiter">()</span> << <span class="Constant">": 'index-address' expects exactly 2 ingredients in '"</span> << current_instruction<span class="Delimiter">().</span>to_string<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 = canonize<span class="Delimiter">(</span>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="Normal">if</span> <span class="Delimiter">(</span>base<span class="Delimiter">.</span>types<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> != Type_ordinal[<span class="Constant">"array"</span>]<span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << current_recipe_name <span class="Delimiter">()</span> << <span class="Constant">": 'index-address' on a non-array "</span> << base<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">long</span> <span class="Normal">long</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 << current_recipe_name<span class="Delimiter">()</span> << <span class="Constant">": tried to access location 0 in '"</span> << current_instruction<span class="Delimiter">().</span>to_string<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 offset = canonize<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">));</span>
vector<<span class="Normal">double</span>> offset_val<span class="Delimiter">(</span>read_memory<span class="Delimiter">(</span>offset<span class="Delimiter">));</span>
vector<type_ordinal> element_type = array_element<span class="Delimiter">(</span>base<span class="Delimiter">.</span>types<span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>offset_val<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> < <span class="Constant">0</span> || offset_val<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> >= Memory[base_address]<span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << current_recipe_name<span class="Delimiter">()</span> << <span class="Constant">": invalid index "</span> << offset_val<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><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="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> result = base_address + <span class="Constant">1</span> + offset_val<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span>*size_of<span class="Delimiter">(</span>element_type<span class="Delimiter">);</span>
products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><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>result<span class="Delimiter">);</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(scenario index_address_out_of_bounds)</span>
<span class="Special">% Hide_warnings = true;</span>
recipe main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">3</span> <span class="Comment"># 3 points</span>
<span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">14</span>
<span class="Constant">3</span>:number<span class="Special"> <- </span>copy <span class="Constant">15</span>
<span class="Constant">4</span>:number<span class="Special"> <- </span>copy <span class="Constant">16</span>
<span class="Constant">5</span>:number<span class="Special"> <- </span>copy <span class="Constant">14</span>
<span class="Constant">6</span>:number<span class="Special"> <- </span>copy <span class="Constant">15</span>
<span class="Constant">7</span>:number<span class="Special"> <- </span>copy <span class="Constant">16</span>
<span class="Constant">8</span>:address:array:point<span class="Special"> <- </span>copy <span class="Constant">1</span>
index-address *<span class="Constant">8</span>:address:array:point<span class="Delimiter">,</span> <span class="Constant">4</span> <span class="Comment"># less than size of array in locations, but larger than its length in elements</span>
]
<span class="traceContains">+warn: main: invalid index 4</span>
<span class="Delimiter">:(scenario index_address_out_of_bounds2)</span>
<span class="Special">% Hide_warnings = true;</span>
recipe main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">3</span> <span class="Comment"># 3 points</span>
<span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">14</span>
<span class="Constant">3</span>:number<span class="Special"> <- </span>copy <span class="Constant">15</span>
<span class="Constant">4</span>:number<span class="Special"> <- </span>copy <span class="Constant">16</span>
<span class="Constant">5</span>:number<span class="Special"> <- </span>copy <span class="Constant">14</span>
<span class="Constant">6</span>:number<span class="Special"> <- </span>copy <span class="Constant">15</span>
<span class="Constant">7</span>:number<span class="Special"> <- </span>copy <span class="Constant">16</span>
<span class="Constant">8</span>:address:array:point<span class="Special"> <- </span>copy <span class="Constant">1</span>
index-address *<span class="Constant">8</span>:address:array:point<span class="Delimiter">,</span> -<span class="Constant">1</span>
]
<span class="traceContains">+warn: main: invalid index -1</span>
<span class="SalientComment">//:: compute the length of an array</span>
<span class="Delimiter">:(scenario array_length)</span>
recipe main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">3</span> <span class="Comment"># length</span>
<span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">14</span>
<span class="Constant">3</span>:number<span class="Special"> <- </span>copy <span class="Constant">15</span>
<span class="Constant">4</span>:number<span class="Special"> <- </span>copy <span class="Constant">16</span>
<span class="Constant">5</span>:number<span class="Special"> <- </span>length <span class="Constant">1</span>:array:number/<span class="Special">raw</span> <span class="Comment"># unsafe</span>
]
<span class="traceContains">+mem: storing 3 in location 5</span>
<span class="Delimiter">:(before "End Primitive Recipe Declarations")</span>
LENGTH<span class="Delimiter">,</span>
<span class="Delimiter">:(before "End Primitive Recipe Numbers")</span>
Recipe_ordinal[<span class="Constant">"length"</span>] = LENGTH<span class="Delimiter">;</span>
<span class="Delimiter">:(before "End Primitive Recipe Implementations")</span>
<span class="Normal">case</span> LENGTH: <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << current_recipe_name<span class="Delimiter">()</span> << <span class="Constant">": 'length' expects exactly 2 ingredients in '"</span> << current_instruction<span class="Delimiter">().</span>to_string<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 x = canonize<span class="Delimiter">(</span>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="Normal">if</span> <span class="Delimiter">(</span>x<span class="Delimiter">.</span>types<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> != Type_ordinal[<span class="Constant">"array"</span>]<span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << <span class="Constant">"tried to calculate length of non-array "</span> << x<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">if</span> <span class="Delimiter">(</span>x<span class="Delimiter">.</span>value == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << current_recipe_name<span class="Delimiter">()</span> << <span class="Constant">": tried to access location 0 in '"</span> << current_instruction<span class="Delimiter">().</span>to_string<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>
products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><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>Memory[x<span class="Delimiter">.</span>value]<span class="Delimiter">);</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
</pre>
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