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//: Instructions can read from addresses pointing at other locations using the
//: 'lookup' property.
:(scenario copy_indirect)
recipe main [
1:address:number <- copy 2
2:number <- copy 34
# This loads location 1 as an address and looks up *that* location.
3:number <- copy 1:address:number/lookup
]
+mem: storing 34 in location 3
:(before "long long int base = x.value" following "vector<double> read_memory(reagent x)")
x = canonize(x);
//: similarly, write to addresses pointing at other locations using the
//: 'lookup' property
:(scenario store_indirect)
recipe main [
1:address:number <- copy 2
1:address:number/lookup <- copy 34
]
+mem: storing 34 in location 2
:(before "long long int base = x.value" following "void write_memory(reagent x, vector<double> data)")
x = canonize(x);
if (x.value == 0) {
raise << "can't write to location 0 in '" << current_instruction().to_string() << "'\n" << end();
return;
}
//: writes to address 0 always loudly fail
:(scenario store_to_0_warns)
% Hide_warnings = true;
recipe main [
1:address:number <- copy 0
1:address:number/lookup <- copy 34
]
-mem: storing 34 in location 0
+warn: can't write to location 0 in '1:address:number/lookup <- copy 34'
:(code)
reagent canonize(reagent x) {
if (is_literal(x)) return x;
//? cout << "canonize\n"; //? 1
reagent r = x;
//? cout << x.to_string() << " => " << r.to_string() << '\n'; //? 1
while (has_property(r, "lookup"))
r = lookup_memory(r);
return r;
}
reagent lookup_memory(reagent x) {
//? cout << "lookup_memory: " << x.to_string() << "\n"; //? 2
static const type_ordinal ADDRESS = Type_ordinal["address"];
reagent result;
if (x.types.at(0) != ADDRESS) {
raise << current_recipe_name() << ": tried to /lookup " << x.original_string << " but it isn't an address\n" << end();
return result;
}
// compute value
if (x.value == 0) {
raise << current_recipe_name() << ": tried to /lookup 0\n" << end();
return result;
}
result.set_value(Memory[x.value]);
trace(Primitive_recipe_depth, "mem") << "location " << x.value << " is " << result.value << end();
// populate types
copy(++x.types.begin(), x.types.end(), inserter(result.types, result.types.begin()));
// drop-one 'lookup'
long long int i = 0;
long long int len = SIZE(x.properties);
for (i = 0; i < len; ++i) {
if (x.properties.at(i).first == "lookup") break;
result.properties.push_back(x.properties.at(i));
}
++i; // skip first lookup
for (; i < len; ++i) {
result.properties.push_back(x.properties.at(i));
}
return result;
}
//:: 'get' can read from container address
:(scenario get_indirect)
recipe main [
1:number <- copy 2
2:number <- copy 34
3:number <- copy 35
4:number <- get 1:address:point/lookup, 0:offset
]
+mem: storing 34 in location 4
:(scenario include_nonlookup_properties)
recipe main [
1:number <- copy 2
2:number <- copy 34
3:number <- copy 35
4:number <- get 1:address:point/lookup/foo, 0:offset
]
+mem: storing 34 in location 4
:(after "reagent base = " following "case GET:")
base = canonize(base);
:(scenario get_address_indirect)
# 'get' can read from container address
recipe main [
1:number <- copy 2
2:number <- copy 34
3:number <- copy 35
4:number <- get-address 1:address:point/lookup, 0:offset
]
+mem: storing 2 in location 4
:(after "reagent base = " following "case GET_ADDRESS:")
base = canonize(base);
//:: abbreviation for '/lookup': a prefix '*'
:(scenario lookup_abbreviation)
recipe main [
1:address:number <- copy 2
2:number <- copy 34
3:number <- copy *1:address:number
]
+mem: storing 34 in location 3
:(before "End Parsing reagent")
{
while (!name.empty() && name.at(0) == '*') {
name.erase(0, 1);
properties.push_back(pair<string, vector<string> >("lookup", vector<string>()));
}
if (name.empty())
raise << "illegal name " << original_string << '\n' << end();
}
//:: helpers for debugging
:(before "End Primitive Recipe Declarations")
_DUMP,
:(before "End Primitive Recipe Numbers")
Recipe_ordinal["$dump"] = _DUMP;
:(before "End Primitive Recipe Implementations")
case _DUMP: {
reagent after_canonize = canonize(current_instruction().ingredients.at(0));
cerr << current_recipe_name() << ": " << current_instruction().ingredients.at(0).name << ' ' << current_instruction().ingredients.at(0).value << " => " << after_canonize.value << " => " << Memory[after_canonize.value] << '\n';
break;
}
//: grab an address, and then dump its value at intervals
//: useful for tracking down memory corruption (writing to an out-of-bounds address)
:(before "End Globals")
long long int foo = -1;
:(before "End Primitive Recipe Declarations")
_FOO,
:(before "End Primitive Recipe Numbers")
Recipe_ordinal["$foo"] = _FOO;
:(before "End Primitive Recipe Implementations")
case _FOO: {
if (current_instruction().ingredients.empty()) {
if (foo != -1) cerr << foo << ": " << Memory[foo] << '\n';
else cerr << '\n';
}
else {
foo = canonize(current_instruction().ingredients.at(0)).value;
}
break;
}
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