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//: Calls can also generate products, using 'reply'.
:(scenario reply)
recipe main [
1:number, 2:number <- f 34:literal
]
recipe f [
12:number <- next-ingredient
13:number <- add 1:literal, 12:number
reply 12:number, 13:number
]
+run: instruction main/0
+mem: storing 34 in location 1
+mem: storing 35 in location 2
:(before "End Primitive Recipe Declarations")
REPLY,
:(before "End Primitive Recipe Numbers")
Recipe_number["reply"] = REPLY;
:(before "End Primitive Recipe Implementations")
case REPLY: {
const instruction& reply_inst = current_instruction(); // save pointer into recipe before pop
Current_routine->calls.pop_front();
// just in case 'main' returns a value, drop it for now
if (Current_routine->calls.empty()) goto stop_running_current_routine;
const instruction& caller_instruction = current_instruction();
// make reply results available to caller
copy(ingredients.begin(), ingredients.end(), inserter(products, products.begin()));
// check that any reply ingredients with /same-as-ingredient connect up
// the corresponding ingredient and product in the caller.
for (index_t i = 0; i < caller_instruction.products.size(); ++i) {
trace("run") << "result " << i << " is " << to_string(ingredients.at(i));
if (has_property(reply_inst.ingredients.at(i), "same-as-ingredient")) {
vector<string> tmp = property(reply_inst.ingredients.at(i), "same-as-ingredient");
assert(tmp.size() == 1);
long long int ingredient_index = to_integer(tmp.at(0));
if (caller_instruction.products.at(i).value != caller_instruction.ingredients.at(ingredient_index).value)
raise << "'same-as-ingredient' result " << caller_instruction.products.at(i).value << " must be location " << caller_instruction.ingredients.at(ingredient_index).value << '\n';
}
}
// refresh instruction_counter to caller's step_index
instruction_counter = current_step_index();
break;
}
//: Products can include containers and exclusive containers, addresses and arrays.
:(scenario reply_container)
recipe main [
3:point <- f 2:literal
]
recipe f [
12:number <- next-ingredient
13:number <- copy 35:literal
reply 12:point
]
+run: instruction main/0
+run: result 0 is [2, 35]
+mem: storing 2 in location 3
+mem: storing 35 in location 4
//: In mu we'd like to assume that any instruction doesn't modify its
//: ingredients unless they're also products. The /same-as-ingredient inside
//: the recipe's 'reply' will help catch accidental misuse of such
//: 'ingredient-results' (sometimes called in-out parameters in other languages).
:(scenario reply_same_as_ingredient)
% Hide_warnings = true;
recipe main [
1:number <- copy 0:literal
2:number <- test1 1:number # call with different ingredient and product
]
recipe test1 [
10:address:number <- next-ingredient
reply 10:address:number/same-as-ingredient:0
]
+warn: 'same-as-ingredient' result 2 must be location 1
:(code)
string to_string(const vector<double>& in) {
if (in.empty()) return "[]";
ostringstream out;
if (in.size() == 1) {
out << in.at(0);
return out.str();
}
out << "[";
for (index_t i = 0; i < in.size(); ++i) {
if (i > 0) out << ", ";
out << in.at(i);
}
out << "]";
return out.str();
}
//: Conditional reply.
:(scenario reply_if)
recipe main [
1:number <- test1
]
recipe test1 [
reply-if 0:literal, 34:literal
reply 35:literal
]
+mem: storing 35 in location 1
:(scenario reply_if2)
recipe main [
1:number <- test1
]
recipe test1 [
reply-if 1:literal, 34:literal
reply 35:literal
]
+mem: storing 34 in location 1
:(before "End Rewrite Instruction(curr)")
// rewrite `reply-if a, b, c, ...` to
// ```
// jump-unless a, 1:offset
// reply b, c, ...
// ```
if (curr.name == "reply-if") {
assert(curr.products.empty());
curr.operation = Recipe_number["jump-unless"];
vector<reagent> results;
copy(++curr.ingredients.begin(), curr.ingredients.end(), inserter(results, results.end()));
curr.ingredients.resize(1);
curr.ingredients.push_back(reagent("1:offset"));
result.steps.push_back(curr);
curr.clear();
curr.operation = Recipe_number["reply"];
curr.ingredients.swap(results);
}
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