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<pre>
<span class="Comment">//: Instructions can read from addresses pointing at other locations using the</span>
<span class="Comment">//: 'lookup' property.</span>
<span class="Delimiter">:(scenario copy_indirect)</span>
def main [
<span class="Constant">1</span>:address:number<span class="Special"> <- </span>copy <span class="Constant">2</span>/unsafe
<span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">34</span>
<span class="Comment"># This loads location 1 as an address and looks up *that* location.</span>
<span class="Constant">3</span>:number<span class="Special"> <- </span>copy <span class="Constant">1</span>:address:number/lookup
]
<span class="traceContains">+mem: storing 34 in location 3</span>
<span class="Delimiter">:(before "long long int base = x.value" following "vector<double> read_memory(reagent x)")</span>
canonize<span class="Delimiter">(</span>x<span class="Delimiter">);</span>
<span class="Comment">//: similarly, write to addresses pointing at other locations using the</span>
<span class="Comment">//: 'lookup' property</span>
<span class="Delimiter">:(scenario store_indirect)</span>
def main [
<span class="Constant">1</span>:address:number<span class="Special"> <- </span>copy <span class="Constant">2</span>/unsafe
<span class="Constant">1</span>:address:number/lookup<span class="Special"> <- </span>copy <span class="Constant">34</span>
]
<span class="traceContains">+mem: storing 34 in location 2</span>
<span class="Delimiter">:(before "long long int base = x.value" following "void write_memory(reagent x, vector<double> data)")</span>
canonize<span class="Delimiter">(</span>x<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 << <span class="Constant">"can't write to location 0 in '"</span> << to_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">return</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Comment">//: writes to address 0 always loudly fail</span>
<span class="Delimiter">:(scenario store_to_0_fails)</span>
<span class="Special">% Hide_errors = true;</span>
def main [
<span class="Constant">1</span>:address:number<span class="Special"> <- </span>copy <span class="Constant">0</span>
<span class="Constant">1</span>:address:number/lookup<span class="Special"> <- </span>copy <span class="Constant">34</span>
]
<span class="traceAbsent">-mem: storing 34 in location 0</span>
<span class="traceContains">+error: can't write to location 0 in '1:address:number/lookup <- copy 34'</span>
<span class="Delimiter">:(code)</span>
<span class="Normal">void</span> canonize<span class="Delimiter">(</span>reagent& x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>x<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span class="Comment">// End canonize(x) Special-cases</span>
<span class="Normal">while</span> <span class="Delimiter">(</span>has_property<span class="Delimiter">(</span>x<span class="Delimiter">,</span> <span class="Constant">"lookup"</span><span class="Delimiter">))</span>
lookup_memory<span class="Delimiter">(</span>x<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Normal">void</span> lookup_memory<span class="Delimiter">(</span>reagent& x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!x<span class="Delimiter">.</span>type || x<span class="Delimiter">.</span>type<span class="Delimiter">-></span>value != get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">"address"</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 /lookup "</span> << x<span class="Delimiter">.</span>original_string << <span class="Constant">" but it isn't an address</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">return</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Comment">// compute value</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 << maybe<span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> << <span class="Constant">"tried to /lookup 0</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>
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">"location "</span> << x<span class="Delimiter">.</span>value << <span class="Constant">" is "</span> << no_scientific<span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> x<span class="Delimiter">.</span>value<span class="Delimiter">))</span> << end<span class="Delimiter">();</span>
x<span class="Delimiter">.</span>set_value<span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> x<span class="Delimiter">.</span>value<span class="Delimiter">));</span>
drop_from_type<span class="Delimiter">(</span>x<span class="Delimiter">,</span> <span class="Constant">"address"</span><span class="Delimiter">);</span>
<span class="Comment">// End Drop Address In lookup_memory(x)</span>
drop_one_lookup<span class="Delimiter">(</span>x<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(scenario canonize_non_pointer_fails_without_crashing)</span>
<span class="Special">% Hide_errors = true;</span>
def foo [
<span class="Constant">1</span>:address:number<span class="Special"> <- </span>get-address *p<span class="Delimiter">,</span> x:offset
]
<span class="Comment"># don't crash</span>
<span class="Delimiter">:(after "bool types_strictly_match(reagent to, reagent from)")</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!canonize_type<span class="Delimiter">(</span>to<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!canonize_type<span class="Delimiter">(</span>from<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Delimiter">:(after "bool is_mu_array(reagent r)")</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!canonize_type<span class="Delimiter">(</span>r<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Delimiter">:(after "bool is_mu_address(reagent r)")</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!canonize_type<span class="Delimiter">(</span>r<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Delimiter">:(after "bool is_mu_number(reagent r)")</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!canonize_type<span class="Delimiter">(</span>r<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Delimiter">:(after "bool is_mu_boolean(reagent r)")</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!canonize_type<span class="Delimiter">(</span>r<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Delimiter">:(after "Update product While Type-checking Merge")</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!canonize_type<span class="Delimiter">(</span>product<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span class="Delimiter">:(code)</span>
<span class="Normal">bool</span> canonize_type<span class="Delimiter">(</span>reagent& r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">while</span> <span class="Delimiter">(</span>has_property<span class="Delimiter">(</span>r<span class="Delimiter">,</span> <span class="Constant">"lookup"</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!r<span class="Delimiter">.</span>type || r<span class="Delimiter">.</span>type<span class="Delimiter">-></span>value != get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">"address"</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
raise << <span class="Constant">"can't lookup non-address: "</span> << to_string<span class="Delimiter">(</span>r<span class="Delimiter">)</span> << <span class="Constant">": "</span> << to_string<span class="Delimiter">(</span>r<span class="Delimiter">.</span>type<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
drop_from_type<span class="Delimiter">(</span>r<span class="Delimiter">,</span> <span class="Constant">"address"</span><span class="Delimiter">);</span>
<span class="Comment">// End Drop Address In canonize_type(r)</span>
drop_one_lookup<span class="Delimiter">(</span>r<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Normal">void</span> drop_from_type<span class="Delimiter">(</span>reagent& r<span class="Delimiter">,</span> string expected_type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!r<span class="Delimiter">.</span>type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << <span class="Constant">"can't drop "</span> << expected_type << <span class="Constant">" from "</span> << to_string<span class="Delimiter">(</span>r<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span> << end<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>r<span class="Delimiter">.</span>type<span class="Delimiter">-></span>name != expected_type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << <span class="Constant">"can't drop2 "</span> << expected_type << <span class="Constant">" from "</span> << to_string<span class="Delimiter">(</span>r<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">return</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
type_tree* tmp = r<span class="Delimiter">.</span>type<span class="Delimiter">;</span>
r<span class="Delimiter">.</span>type = tmp<span class="Delimiter">-></span>right<span class="Delimiter">;</span>
tmp<span class="Delimiter">-></span>right = <span class="Constant">NULL</span><span class="Delimiter">;</span>
<span class="Normal">delete</span> tmp<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Normal">void</span> drop_one_lookup<span class="Delimiter">(</span>reagent& r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">for</span> <span class="Delimiter">(</span>vector<pair<string<span class="Delimiter">,</span> string_tree*> >::iterator p = r<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != r<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>p<span class="Delimiter">-></span>first == <span class="Constant">"lookup"</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
r<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>p<span class="Delimiter">);</span>
<span class="Identifier">return</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
assert<span class="Delimiter">(</span><span class="Constant">false</span><span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="SalientComment">//:: 'get' can read from container address</span>
<span class="Delimiter">:(scenario get_indirect)</span>
def main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">2</span>
<span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">34</span>
<span class="Constant">3</span>:number<span class="Special"> <- </span>copy <span class="Constant">35</span>
<span class="Constant">4</span>:number<span class="Special"> <- </span>get <span class="Constant">1</span>:address:point/lookup<span class="Delimiter">,</span> <span class="Constant">0</span>:offset
]
<span class="traceContains">+mem: storing 34 in location 4</span>
<span class="Delimiter">:(scenario get_indirect2)</span>
def main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">2</span>
<span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">34</span>
<span class="Constant">3</span>:number<span class="Special"> <- </span>copy <span class="Constant">35</span>
<span class="Constant">4</span>:address:number<span class="Special"> <- </span>copy <span class="Constant">5</span>/unsafe
*<span class="Constant">4</span>:address:number<span class="Special"> <- </span>get <span class="Constant">1</span>:address:point/lookup<span class="Delimiter">,</span> <span class="Constant">0</span>:offset
]
<span class="traceContains">+mem: storing 34 in location 5</span>
<span class="Delimiter">:(scenario include_nonlookup_properties)</span>
def main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">2</span>
<span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">34</span>
<span class="Constant">3</span>:number<span class="Special"> <- </span>copy <span class="Constant">35</span>
<span class="Constant">4</span>:number<span class="Special"> <- </span>get <span class="Constant">1</span>:address:point/lookup/foo<span class="Delimiter">,</span> <span class="Constant">0</span>:offset
]
<span class="traceContains">+mem: storing 34 in location 4</span>
<span class="Delimiter">:(after "Update GET base in Check")</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!canonize_type<span class="Delimiter">(</span>base<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">:(after "Update GET product in Check")</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!canonize_type<span class="Delimiter">(</span>product<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">:(after "Update GET base in Run")</span>
canonize<span class="Delimiter">(</span>base<span class="Delimiter">);</span>
<span class="Delimiter">:(scenario get_address_indirect)</span>
<span class="Comment"># 'get' can read from container address</span>
def main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">2</span>
<span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">34</span>
<span class="Constant">3</span>:number<span class="Special"> <- </span>copy <span class="Constant">35</span>
<span class="Constant">4</span>:address:number<span class="Special"> <- </span>get-address <span class="Constant">1</span>:address:point/lookup<span class="Delimiter">,</span> <span class="Constant">0</span>:offset
]
<span class="traceContains">+mem: storing 2 in location 4</span>
<span class="Delimiter">:(after "Update GET_ADDRESS base in Check")</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!canonize_type<span class="Delimiter">(</span>base<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">:(after "Update GET_ADDRESS product in Check")</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!canonize_type<span class="Delimiter">(</span>base<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">:(after "Update GET_ADDRESS base in Run")</span>
canonize<span class="Delimiter">(</span>base<span class="Delimiter">);</span>
<span class="SalientComment">//:: abbreviation for '/lookup': a prefix '*'</span>
<span class="Delimiter">:(scenario lookup_abbreviation)</span>
def main [
<span class="Constant">1</span>:address:number<span class="Special"> <- </span>copy <span class="Constant">2</span>/unsafe
<span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">34</span>
<span class="Constant">3</span>:number<span class="Special"> <- </span>copy *<span class="Constant">1</span>:address:number
]
<span class="traceContains">+parse: ingredient: 1: ("address" "number"), {"lookup": ()}</span>
<span class="traceContains">+mem: storing 34 in location 3</span>
<span class="Delimiter">:(before "End Parsing reagent")</span>
<span class="Delimiter">{</span>
<span class="Normal">while</span> <span class="Delimiter">(</span>!name<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> && name<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> == <span class="Constant">'*'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
name<span class="Delimiter">.</span>erase<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">1</span><span class="Delimiter">);</span>
properties<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair<string<span class="Delimiter">,</span> string_tree*><span class="Delimiter">(</span><span class="Constant">"lookup"</span><span class="Delimiter">,</span> <span class="Constant">NULL</span><span class="Delimiter">));</span>
<span class="Delimiter">}</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>name<span class="Delimiter">.</span>empty<span class="Delimiter">())</span>
raise << <span class="Constant">"illegal name "</span> << original_string << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Delimiter">}</span>
<span class="SalientComment">//:: helpers for debugging</span>
<span class="Delimiter">:(before "End Primitive Recipe Declarations")</span>
_DUMP<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">"$dump"</span><span class="Delimiter">,</span> _DUMP<span class="Delimiter">);</span>
<span class="Delimiter">:(before "End Primitive Recipe Implementations")</span>
<span class="Normal">case</span> _DUMP: <span class="Delimiter">{</span>
reagent after_canonize = 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>
canonize<span class="Delimiter">(</span>after_canonize<span class="Delimiter">);</span>
cerr << maybe<span class="Delimiter">(</span>current_recipe_name<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>name << <span class="Constant">' '</span> << no_scientific<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>value<span class="Delimiter">)</span> << <span class="Constant">" => "</span> << no_scientific<span class="Delimiter">(</span>after_canonize<span class="Delimiter">.</span>value<span class="Delimiter">)</span> << <span class="Constant">" => "</span> << no_scientific<span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> after_canonize<span class="Delimiter">.</span>value<span class="Delimiter">))</span> << <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Comment">//: grab an address, and then dump its value at intervals</span>
<span class="Comment">//: useful for tracking down memory corruption (writing to an out-of-bounds address)</span>
<span class="Delimiter">:(before "End Globals")</span>
<span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> foo = -<span class="Constant">1</span><span class="Delimiter">;</span>
<span class="Delimiter">:(before "End Primitive Recipe Declarations")</span>
_FOO<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">"$foo"</span><span class="Delimiter">,</span> _FOO<span class="Delimiter">);</span>
<span class="Delimiter">:(before "End Primitive Recipe Implementations")</span>
<span class="Normal">case</span> _FOO: <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>foo != -<span class="Constant">1</span><span class="Delimiter">)</span> cerr << foo << <span class="Constant">": "</span> << no_scientific<span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> foo<span class="Delimiter">))</span> << <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span class="Normal">else</span> cerr << <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Normal">else</span> <span class="Delimiter">{</span>
reagent tmp = 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>
canonize<span class="Delimiter">(</span>tmp<span class="Delimiter">);</span>
foo = tmp<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
</pre>
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