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//: Instructions can read from addresses pointing at other locations using the
//: 'deref' property.
:(scenario "copy_indirect")
recipe main [
1:address:integer <- copy 2:literal
2:integer <- copy 34:literal
# This loads location 1 as an address and looks up *that* location.
3:integer <- copy 1:address:integer/deref
]
+run: instruction main/2
+mem: location 1 is 2
+mem: location 2 is 34
+mem: storing 34 in location 3
:(before "int base = x.value" following "vector<int> read_memory(reagent x)")
x = canonize(x);
//: similarly, write to addresses pointing at other locations using the
//: 'deref' property
:(scenario "store_indirect")
recipe main [
1:address:integer <- copy 2:literal
1:address:integer/deref <- copy 34:literal
]
+run: instruction main/1
+mem: location 1 is 2
+mem: storing 34 in location 2
:(before "int base = x.value" following "void write_memory(reagent x, vector<int> data)")
x = canonize(x);
:(code)
reagent canonize(reagent x) {
//? cout << "canonize\n"; //? 1
reagent r = x;
//? cout << x.to_string() << " => " << r.to_string() << '\n'; //? 1
while (has_property(r, "deref"))
r = deref(r);
return r;
}
bool has_property(reagent x, string name) {
for (size_t i = 0; i < x.properties.size(); ++i) {
if (x.properties[i].first == name) return true;
}
return false;
}
reagent deref(reagent x) {
//? cout << "deref: " << x.to_string() << "\n"; //? 2
static const int ADDRESS = Type_number["address"];
reagent result;
assert(x.types[0] == ADDRESS);
// compute value
result.set_value(Memory[x.value]);
trace("mem") << "location " << x.value << " is " << result.value;
// populate types
copy(++x.types.begin(), x.types.end(), inserter(result.types, result.types.begin()));
// drop-one 'deref'
int i = 0;
int len = x.properties.size();
for (i = 0; i < len; ++i) {
if (x.properties[i].first == "deref") break;
result.properties.push_back(x.properties[i]);
}
++i; // skip first deref
for (; i < len; ++i) {
result.properties.push_back(x.properties[i]);
}
return result;
}
//: 'get' can read from record address
:(scenario "get_indirect")
recipe main [
1:integer <- copy 2:literal
2:integer <- copy 34:literal
3:integer <- copy 35:literal
4:integer <- get 1:address:point/deref, 0:offset
]
+run: instruction main/3
+run: address to copy is 2
+run: product 0 is 34
+mem: storing 34 in location 4
:(scenario "include_nonderef_properties")
recipe main [
1:integer <- copy 2:literal
2:integer <- copy 34:literal
3:integer <- copy 35:literal
4:integer <- get 1:address:point/deref/foo, 0:offset
]
+run: instruction main/3
+run: address to copy is 2
+run: product 0 is 34
+mem: storing 34 in location 4
:(after "reagent base = " following "case GET:")
base = canonize(base);
:(scenario "get_address_indirect")
# 'get' can read from record address
recipe main [
1:integer <- copy 2:literal
2:integer <- copy 34:literal
3:integer <- copy 35:literal
4:integer <- get-address 1:address:point/deref, 0:offset
]
+run: instruction main/3
+run: address to copy is 2
+run: product 0 is 2
:(after "reagent base = " following "case GET_ADDRESS:")
base = canonize(base);
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