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//: Arrays contain a variable number of elements of the same type.
//:
//: You can create arrays of containers, but containers can only contain
//: elements of a fixed size, so you can't create containers containing arrays.
//: Create containers containing addresses to arrays instead.
:(scenario copy_array)
# Arrays can be copied around with a single instruction just like integers,
# no matter how large they are.
recipe main [
1:integer <- copy 3:literal
2:integer <- copy 14:literal
3:integer <- copy 15:literal
4:integer <- copy 16:literal
5:array:integer <- copy 1:array:integer
]
+run: instruction main/4
+run: ingredient 0 is 1
+mem: location 1 is 3
+mem: location 2 is 14
+mem: location 3 is 15
+mem: location 4 is 16
+mem: storing 3 in location 5
+mem: storing 14 in location 6
+mem: storing 15 in location 7
+mem: storing 16 in location 8
:(scenario copy_array_indirect)
recipe main [
1:integer <- copy 3:literal
2:integer <- copy 14:literal
3:integer <- copy 15:literal
4:integer <- copy 16:literal
5:address:array:integer <- copy 1:literal
6:array:integer <- copy 5:address:array:integer/deref
]
+run: instruction main/5
+run: ingredient 0 is 5
+mem: location 1 is 3
+mem: location 2 is 14
+mem: location 3 is 15
+mem: location 4 is 16
+mem: storing 3 in location 6
+mem: storing 14 in location 7
+mem: storing 15 in location 8
+mem: storing 16 in location 9
//: disable the size mismatch check since the destination array need not be initialized
:(replace "if (size_of(x) != data.size())" following "void write_memory(reagent x, vector<int> data)")
if (x.types[0] != Type_number["array"] && size_of(x) != data.size())
:(after "size_t size_of(const reagent& r)")
static const int ARRAY = Type_number["array"];
if (r.types[0] == ARRAY) {
assert(r.types.size() > 1);
// skip the 'array' type to get at the element type
return 1 + Memory[r.value]*size_of(array_element(r.types));
}
//: To access elements of an array, use 'index'
:(scenario "index")
recipe main [
1:integer <- copy 3:literal
2:integer <- copy 14:literal
3:integer <- copy 15:literal
4:integer <- copy 16:literal
5:integer <- index 1:array:integer, 0:literal
]
+run: instruction main/4
+run: address to copy is 2
+run: its type is 1
+mem: location 2 is 14
+run: product 0 is 14
+mem: storing 14 in location 5
:(scenario "index_direct_offset")
recipe main [
1:integer <- copy 3:literal
2:integer <- copy 14:literal
3:integer <- copy 15:literal
4:integer <- copy 16:literal
5:integer <- copy 0:literal
6:integer <- index 1:array:integer, 5:integer
]
+run: instruction main/5
+run: address to copy is 2
+run: its type is 1
+mem: location 2 is 14
+run: product 0 is 14
+mem: storing 14 in location 6
:(before "End Primitive Recipe Declarations")
INDEX,
:(before "End Primitive Recipe Numbers")
Recipe_number["index"] = INDEX;
:(before "End Primitive Recipe Implementations")
case INDEX: {
static const int ARRAY = Type_number["array"];
//? if (Trace_stream) Trace_stream->dump_layer = "run"; //? 1
trace("run") << "ingredient 0 is " << instructions[pc].ingredients[0].to_string();
reagent base = canonize(instructions[pc].ingredients[0]);
//? trace("run") << "ingredient 0 after canonize: " << base.to_string(); //? 1
int base_address = base.value;
assert(base.types[0] == ARRAY);
trace("run") << "ingredient 1 is " << instructions[pc].ingredients[1].to_string();
reagent offset = canonize(instructions[pc].ingredients[1]);
//? trace("run") << "ingredient 1 after canonize: " << offset.to_string(); //? 1
vector<int> offset_val(read_memory(offset));
vector<type_number> element_type = array_element(base.types);
//? trace("run") << "offset: " << offset_val[0]; //? 1
//? trace("run") << "size of elements: " << size_of(element_type); //? 1
int src = base_address + 1 + offset_val[0]*size_of(element_type);
trace("run") << "address to copy is " << src;
trace("run") << "its type is " << element_type[0];
reagent tmp;
tmp.set_value(src);
copy(element_type.begin(), element_type.end(), inserter(tmp.types, tmp.types.begin()));
//? trace("run") << "AAA: " << tmp.to_string() << '\n'; //? 3
vector<int> result(read_memory(tmp));
trace("run") << "product 0 is " << result[0];
write_memory(instructions[pc].products[0], result);
//? if (Trace_stream) Trace_stream->dump_layer = ""; //? 1
break;
}
:(code)
vector<type_number> array_element(const vector<type_number>& types) {
return vector<type_number>(++types.begin(), types.end());
}
:(scenario "index_address")
recipe main [
1:integer <- copy 3:literal
2:integer <- copy 14:literal
3:integer <- copy 15:literal
4:integer <- copy 16:literal
5:integer <- index-address 1:array:integer, 0:literal
]
+run: instruction main/4
+run: address to copy is 2
+mem: storing 2 in location 5
//: To write to elements of containers, you need their address.
:(scenario "index_indirect")
recipe main [
1:integer <- copy 3:literal
2:integer <- copy 14:literal
3:integer <- copy 15:literal
4:integer <- copy 16:literal
5:address:array:integer <- copy 1:literal
6:integer <- index 5:address:array:integer/deref, 1:literal
]
+run: instruction main/5
+mem: storing 15 in location 6
// vim:ft=cpp
:(before "End Primitive Recipe Declarations")
INDEX_ADDRESS,
:(before "End Primitive Recipe Numbers")
Recipe_number["index-address"] = INDEX_ADDRESS;
:(before "End Primitive Recipe Implementations")
case INDEX_ADDRESS: {
static const int ARRAY = Type_number["array"];
trace("run") << "ingredient 0 is " << instructions[pc].ingredients[0].name;
reagent base = canonize(instructions[pc].ingredients[0]);
int base_address = base.value;
assert(base.types[0] == ARRAY);
trace("run") << "ingredient 1 is " << instructions[pc].ingredients[1].to_string();
reagent offset = canonize(instructions[pc].ingredients[1]);
vector<int> offset_val(read_memory(offset));
vector<type_number> element_type = array_element(base.types);
int src = base_address + 1 + offset_val[0]*size_of(element_type);
trace("run") << "address to copy is " << src;
vector<int> result;
result.push_back(src);
trace("run") << "product 0 is " << result[0];
write_memory(instructions[pc].products[0], result);
break;
}
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