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<pre id='vimCodeElement'>
<span class="Comment">//: Calls can also generate products, using 'reply'.</span>
<span class="Delimiter">:(scenario reply)</span>
recipe main [
<span class="Constant">3</span>:integer<span class="Delimiter">,</span> <span class="Constant">4</span>:integer<span class="Special"> <- </span>f <span class="Constant">2</span>:literal
]
recipe f [
<span class="Constant">12</span>:integer<span class="Special"> <- </span>next-ingredient
<span class="Constant">13</span>:integer<span class="Special"> <- </span>add <span class="Constant">1</span>:literal<span class="Delimiter">,</span> <span class="Constant">12</span>:integer
reply <span class="Constant">12</span>:integer<span class="Delimiter">,</span> <span class="Constant">13</span>:integer
]
<span class="traceContains">+run: instruction main/0</span>
<span class="traceContains">+run: result 0 is 2</span>
<span class="traceContains">+mem: storing 2 in location 3</span>
<span class="traceContains">+run: result 1 is 3</span>
<span class="traceContains">+mem: storing 3 in location 4</span>
<span class="Delimiter">:(before "End Primitive Recipe Declarations")</span>
REPLY<span class="Delimiter">,</span>
<span class="Delimiter">:(before "End Primitive Recipe Numbers")</span>
Recipe_number[<span class="Constant">"reply"</span>] = REPLY<span class="Delimiter">;</span>
<span class="Delimiter">:(before "End Primitive Recipe Implementations")</span>
case REPLY: <span class="Delimiter">{</span>
vector<vector<long long int> > callee_results<span class="Delimiter">;</span>
for <span class="Delimiter">(</span>index_t i = <span class="Constant">0</span><span class="Delimiter">;</span> i < current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>size<span class="Delimiter">();</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
callee_results<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>read_memory<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients[i]<span class="Delimiter">));</span>
<span class="Delimiter">}</span>
const instruction& reply_inst = current_instruction<span class="Delimiter">();</span> <span class="Comment">// save pointer into recipe before pop</span>
Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>pop<span class="Delimiter">();</span>
assert<span class="Delimiter">(</span>!Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
const instruction& caller_instruction = current_instruction<span class="Delimiter">();</span>
assert<span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>products<span class="Delimiter">.</span>size<span class="Delimiter">()</span> <= callee_results<span class="Delimiter">.</span>size<span class="Delimiter">());</span>
for <span class="Delimiter">(</span>index_t i = <span class="Constant">0</span><span class="Delimiter">;</span> i < caller_instruction<span class="Delimiter">.</span>products<span class="Delimiter">.</span>size<span class="Delimiter">();</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
trace<span class="Delimiter">(</span><span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"result "</span> << i << <span class="Constant">" is "</span> << to_string<span class="Delimiter">(</span>callee_results[i]<span class="Delimiter">);</span>
<span class="Comment">// check that any reply ingredients with /same-as-ingredient connect up</span>
<span class="Comment">// the corresponding ingredient and product in the caller.</span>
if <span class="Delimiter">(</span>has_property<span class="Delimiter">(</span>reply_inst<span class="Delimiter">.</span>ingredients[i]<span class="Delimiter">,</span> <span class="Constant">"same-as-ingredient"</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
vector<string> tmp = property<span class="Delimiter">(</span>reply_inst<span class="Delimiter">.</span>ingredients[i]<span class="Delimiter">,</span> <span class="Constant">"same-as-ingredient"</span><span class="Delimiter">);</span>
assert<span class="Delimiter">(</span>tmp<span class="Delimiter">.</span>size<span class="Delimiter">()</span> == <span class="Constant">1</span><span class="Delimiter">);</span>
long long int ingredient_index = to_int<span class="Delimiter">(</span>tmp[<span class="Constant">0</span>]<span class="Delimiter">);</span>
if <span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>products[i]<span class="Delimiter">.</span>value != caller_instruction<span class="Delimiter">.</span>ingredients[ingredient_index]<span class="Delimiter">.</span>value<span class="Delimiter">)</span>
raise << <span class="Constant">"'same-as-ingredient' result "</span> << caller_instruction<span class="Delimiter">.</span>products[i]<span class="Delimiter">.</span>value << <span class="Constant">" must be location "</span> << caller_instruction<span class="Delimiter">.</span>ingredients[ingredient_index]<span class="Delimiter">.</span>value << <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
write_memory<span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>products[i]<span class="Delimiter">,</span> callee_results[i]<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Identifier">break</span><span class="Delimiter">;</span> <span class="Comment">// instruction loop will increment caller's step_index</span>
<span class="Delimiter">}</span>
<span class="Comment">//: Products can include containers and exclusive containers, addresses and arrays.</span>
<span class="Delimiter">:(scenario reply_container)</span>
recipe main [
<span class="Constant">3</span>:point<span class="Special"> <- </span>f <span class="Constant">2</span>:literal
]
recipe f [
<span class="Constant">12</span>:integer<span class="Special"> <- </span>next-ingredient
<span class="Constant">13</span>:integer<span class="Special"> <- </span>copy <span class="Constant">35</span>:literal
reply <span class="Constant">12</span>:point
]
<span class="traceContains">+run: instruction main/0</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">//: In mu we'd like to assume that any instruction doesn't modify its</span>
<span class="Comment">//: ingredients unless they're also products. The /same-as-ingredient inside</span>
<span class="Comment">//: the recipe's 'reply' will help catch accidental misuse of such</span>
<span class="Comment">//: 'ingredient-results' (sometimes called in-out parameters in other languages).</span>
<span class="Delimiter">:(scenario reply_same_as_ingredient)</span>
<span class="Special">% Hide_warnings = true;</span>
recipe main [
<span class="Constant">1</span>:address:integer<span class="Special"> <- </span>new integer:type
<span class="Constant">2</span>:address:integer<span class="Special"> <- </span>test1 <span class="Constant">1</span>:address:integer <span class="Comment"># call with different ingredient and product</span>
]
recipe test1 [
<span class="Constant">10</span>:address:integer<span class="Special"> <- </span>next-ingredient
reply <span class="Constant">10</span>:address:integer/same-as-ingredient:<span class="Constant">0</span>
]
<span class="traceContains">+warn: 'same-as-ingredient' result 2 must be location 1</span>
<span class="Delimiter">:(code)</span>
string to_string<span class="Delimiter">(</span>const vector<long long int>& in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>in<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span> <span class="Constant">"[]"</span><span class="Delimiter">;</span>
ostringstream out<span class="Delimiter">;</span>
if <span class="Delimiter">(</span>in<span class="Delimiter">.</span>size<span class="Delimiter">()</span> == <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
out << in[<span class="Constant">0</span>]<span class="Delimiter">;</span>
<span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
<span class="Delimiter">}</span>
out << <span class="Constant">"["</span><span class="Delimiter">;</span>
for <span class="Delimiter">(</span>index_t i = <span class="Constant">0</span><span class="Delimiter">;</span> i < in<span class="Delimiter">.</span>size<span class="Delimiter">();</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>i > <span class="Constant">0</span><span class="Delimiter">)</span> out << <span class="Constant">", "</span><span class="Delimiter">;</span>
out << in[i]<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
out << <span class="Constant">"]"</span><span class="Delimiter">;</span>
<span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
<span class="Delimiter">}</span>
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