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<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>
recipe main [
<span class="Constant">1</span>:address: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="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>
x = 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>
recipe main [
<span class="Constant">1</span>:address:number<span class="Special"> <- </span>copy <span class="Constant">2</span>
<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>
x = canonize<span class="Delimiter">(</span>x<span class="Delimiter">);</span>
if <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> << 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">return</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(after "bool is_mu_array(reagent r)")</span>
r = canonize<span class="Delimiter">(</span>r<span class="Delimiter">);</span>
<span class="Comment">//: writes to address 0 always loudly fail</span>
<span class="Delimiter">:(scenario store_to_0_warns)</span>
<span class="Special">% Hide_warnings = true;</span>
recipe 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">+warn: can't write to location 0 in '1:address:number/lookup <- copy 34'</span>
<span class="Delimiter">:(code)</span>
reagent canonize<span class="Delimiter">(</span>reagent x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>x<span class="Delimiter">))</span> <span class="Identifier">return</span> x<span class="Delimiter">;</span>
<span class="CommentedCode">//? cout << "canonize\n"; //? 1</span>
reagent r = x<span class="Delimiter">;</span>
<span class="CommentedCode">//? cout << x.to_string() << " => " << r.to_string() << '\n'; //? 1</span>
while <span class="Delimiter">(</span>has_property<span class="Delimiter">(</span>r<span class="Delimiter">,</span> <span class="Constant">"lookup"</span><span class="Delimiter">))</span>
r = lookup_memory<span class="Delimiter">(</span>r<span class="Delimiter">);</span>
<span class="Identifier">return</span> r<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
reagent lookup_memory<span class="Delimiter">(</span>reagent x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="CommentedCode">//? cout << "lookup_memory: " << x.to_string() << "\n"; //? 2</span>
static const type_ordinal ADDRESS = Type_ordinal[<span class="Constant">"address"</span>]<span class="Delimiter">;</span>
reagent result<span class="Delimiter">;</span>
if <span class="Delimiter">(</span>x<span class="Delimiter">.</span>types<span class="Delimiter">.</span>empty<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> != ADDRESS<span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << 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> result<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Comment">// compute value</span>
if <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 /lookup 0</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
result<span class="Delimiter">.</span>set_value<span class="Delimiter">(</span>Memory[x<span class="Delimiter">.</span>value]<span class="Delimiter">);</span>
trace<span class="Delimiter">(</span>Primitive_recipe_depth<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> << result<span class="Delimiter">.</span>value << end<span class="Delimiter">();</span>
<span class="Comment">// populate types</span>
copy<span class="Delimiter">(</span>++x<span class="Delimiter">.</span>types<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> x<span class="Delimiter">.</span>types<span class="Delimiter">.</span>end<span class="Delimiter">(),</span> inserter<span class="Delimiter">(</span>result<span class="Delimiter">.</span>types<span class="Delimiter">,</span> result<span class="Delimiter">.</span>types<span class="Delimiter">.</span>begin<span class="Delimiter">()));</span>
<span class="Comment">// drop-one 'lookup'</span>
long long int i = <span class="Constant">0</span><span class="Delimiter">;</span>
long long int len = SIZE<span class="Delimiter">(</span>x<span class="Delimiter">.</span>properties<span class="Delimiter">);</span>
for <span class="Delimiter">(</span>i = <span class="Constant">0</span><span class="Delimiter">;</span> i < len<span class="Delimiter">;</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first == <span class="Constant">"lookup"</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
result<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
<span class="Delimiter">}</span>
++i<span class="Delimiter">;</span> <span class="Comment">// skip first lookup</span>
for <span class="Delimiter">(;</span> i < len<span class="Delimiter">;</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
result<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<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="SalientComment">//:: 'get' can read from container address</span>
<span class="Delimiter">:(scenario get_indirect)</span>
recipe 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 include_nonlookup_properties)</span>
recipe 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 "reagent base = " following "case GET:")</span>
base = 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>
recipe 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-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 "reagent base = " following "case GET_ADDRESS:")</span>
base = 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>
recipe main [
<span class="Constant">1</span>:address: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">1</span>:address:number
]
<span class="traceContains">+mem: storing 34 in location 3</span>
<span class="Delimiter">:(before "End Parsing reagent")</span>
<span class="Delimiter">{</span>
while <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> vector<string> ><span class="Delimiter">(</span><span class="Constant">"lookup"</span><span class="Delimiter">,</span> vector<string><span class="Delimiter">()));</span>
<span class="Delimiter">}</span>
if <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>
Recipe_ordinal[<span class="Constant">"$dump"</span>] = _DUMP<span class="Delimiter">;</span>
<span class="Delimiter">:(before "End Primitive Recipe Implementations")</span>
case _DUMP: <span class="Delimiter">{</span>
reagent after_canonize = canonize<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
cerr << current_recipe_name<span class="Delimiter">()</span> << <span class="Constant">": "</span> << current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name << <span class="Constant">' '</span> << current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>value << <span class="Constant">" => "</span> << after_canonize<span class="Delimiter">.</span>value << <span class="Constant">" => "</span> << Memory[after_canonize<span class="Delimiter">.</span>value] << <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Comment">//: grab an address, and then dump its value at intervals</span>
<span class="Comment">//: useful for tracking down memory corruption (writing to an out-of-bounds address)</span>
<span class="Delimiter">:(before "End Globals")</span>
long long int foo = -<span class="Constant">1</span><span class="Delimiter">;</span>
<span class="Delimiter">:(before "End Primitive Recipe Declarations")</span>
_FOO<span class="Delimiter">,</span>
<span class="Delimiter">:(before "End Primitive Recipe Numbers")</span>
Recipe_ordinal[<span class="Constant">"$foo"</span>] = _FOO<span class="Delimiter">;</span>
<span class="Delimiter">:(before "End Primitive Recipe Implementations")</span>
case _FOO: <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>foo != -<span class="Constant">1</span><span class="Delimiter">)</span> cerr << foo << <span class="Constant">": "</span> << Memory[foo] << <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
else cerr << <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
else <span class="Delimiter">{</span>
foo = 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>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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