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//: Writing to a literal (not computed) address of 0 in a recipe chains two
//: spaces together. When a variable has a property of /space:1, it looks up
//: the variable in the chained/surrounding space. /space:2 looks up the
//: surrounding space of the surrounding space, etc.
:(scenario closure)
def main [
default-space:space <- new location:type, 30
1:space/names:new-counter <- new-counter
2:num/raw <- increment-counter 1:space/names:new-counter
3:num/raw <- increment-counter 1:space/names:new-counter
]
def new-counter [
default-space:space <- new location:type, 30
x:num <- copy 23
y:num <- copy 3 # variable that will be incremented
return default-space:space
]
def increment-counter [
default-space:space <- new location:type, 30
0:space/names:new-counter <- next-ingredient # outer space must be created by 'new-counter' above
y:num/space:1 <- add y:num/space:1, 1 # increment
y:num <- copy 234 # dummy
return y:num/space:1
]
+name: lexically surrounding space for recipe increment-counter comes from new-counter
+mem: storing 5 in location 3
//: To make this work, compute the recipe that provides names for the
//: surrounding space of each recipe.
:(before "End Globals")
map<recipe_ordinal, recipe_ordinal> Surrounding_space;
:(before "Transform.push_back(transform_names)")
Transform.push_back(collect_surrounding_spaces); // idempotent
:(code)
void collect_surrounding_spaces(const recipe_ordinal r) {
trace(9991, "transform") << "--- collect surrounding spaces for recipe " << get(Recipe, r).name << end();
for (int i = 0; i < SIZE(get(Recipe, r).steps); ++i) {
const instruction& inst = get(Recipe, r).steps.at(i);
if (inst.is_label) continue;
for (int j = 0; j < SIZE(inst.products); ++j) {
if (is_literal(inst.products.at(j))) continue;
if (inst.products.at(j).name != "0") continue;
if (!is_space(inst.products.at(j))) {
raise << "slot 0 should always have type address:array:location, but is '" << to_string(inst.products.at(j)) << "'\n" << end();
continue;
}
string_tree* s = property(inst.products.at(j), "names");
if (!s) {
raise << "slot 0 requires a /names property in recipe '" << get(Recipe, r).name << "'\n" << end();
continue;
}
if (!s->atom) raise << "slot 0 should have a single value in /names, but got '" << to_string(inst.products.at(j)) << "'\n" << end();
const string& surrounding_recipe_name = s->value;
if (surrounding_recipe_name.empty()) {
raise << "slot 0 doesn't initialize its /names property in recipe '" << get(Recipe, r).name << "'\n" << end();
continue;
}
if (contains_key(Surrounding_space, r)
&& get(Surrounding_space, r) != get(Recipe_ordinal, surrounding_recipe_name)) {
raise << "recipe '" << get(Recipe, r).name << "' can have only one 'surrounding' recipe but has '" << get(Recipe, get(Surrounding_space, r)).name << "' and '" << surrounding_recipe_name << "'\n" << end();
continue;
}
trace(9993, "name") << "lexically surrounding space for recipe " << get(Recipe, r).name << " comes from " << surrounding_recipe_name << end();
if (!contains_key(Recipe_ordinal, surrounding_recipe_name)) {
raise << "can't find recipe providing surrounding space for '" << get(Recipe, r).name << "'; looking for '" << surrounding_recipe_name << "'\n" << end();
continue;
}
put(Surrounding_space, r, get(Recipe_ordinal, surrounding_recipe_name));
}
}
}
//: Once surrounding spaces are available, transform_names uses them to handle
//: /space properties.
:(replace{} "int lookup_name(const reagent& r, const recipe_ordinal default_recipe)")
int lookup_name(const reagent& x, const recipe_ordinal default_recipe) {
if (!has_property(x, "space")) {
if (Name[default_recipe].empty()) raise << "name not found: " << x.name << '\n' << end();
return Name[default_recipe][x.name];
}
string_tree* p = property(x, "space");
if (!p || !p->atom) raise << "/space property should have exactly one (non-negative integer) value\n" << end();
int n = to_integer(p->value);
assert(n >= 0);
recipe_ordinal surrounding_recipe = lookup_surrounding_recipe(default_recipe, n);
if (surrounding_recipe == -1) return -1;
set<recipe_ordinal> done;
vector<recipe_ordinal> path;
return lookup_name(x, surrounding_recipe, done, path);
}
// If the recipe we need to lookup this name in doesn't have names done yet,
// recursively call transform_names on it.
int lookup_name(const reagent& x, const recipe_ordinal r, set<recipe_ordinal>& done, vector<recipe_ordinal>& path) {
if (!Name[r].empty()) return Name[r][x.name];
if (contains_key(done, r)) {
raise << "can't compute address of '" << to_string(x) << "' because\n" << end();
for (int i = 1; i < SIZE(path); ++i) {
raise << path.at(i-1) << " requires computing names of " << path.at(i) << '\n' << end();
}
raise << path.at(SIZE(path)-1) << " requires computing names of " << r << "..ad infinitum\n" << end();
return -1;
}
done.insert(r);
path.push_back(r);
transform_names(r); // Not passing 'done' through. Might this somehow cause an infinite loop?
assert(!Name[r].empty());
return Name[r][x.name];
}
recipe_ordinal lookup_surrounding_recipe(const recipe_ordinal r, int n) {
if (n == 0) return r;
if (!contains_key(Surrounding_space, r)) {
raise << "don't know surrounding recipe of '" << get(Recipe, r).name << "'\n" << end();
return -1;
}
assert(contains_key(Surrounding_space, r));
return lookup_surrounding_recipe(get(Surrounding_space, r), n-1);
}
//: weaken use-before-set detection just a tad
:(replace{} "bool already_transformed(const reagent& r, const map<string, int>& names)")
bool already_transformed(const reagent& r, const map<string, int>& names) {
if (has_property(r, "space")) {
string_tree* p = property(r, "space");
if (!p || !p->atom) {
raise << "/space property should have exactly one (non-negative integer) value in '" << r.original_string << "'\n" << end();
return false;
}
if (p->value != "0") return true;
}
return contains_key(names, r.name);
}
:(scenario missing_surrounding_space)
% Hide_errors = true;
def f [
local-scope
x:num/space:1 <- copy 34
]
+error: don't know surrounding recipe of 'f'
+error: f: can't find a place to store 'x'
//: extra test for try_reclaim_locals() from previous layers
:(scenario local_scope_ignores_nonlocal_spaces)
def new-scope [
new-default-space
x:&:num <- new number:type
*x:&:num <- copy 34
return default-space:space
]
def use-scope [
local-scope
outer:space <- next-ingredient
0:space/names:new-scope <- copy outer:space
return *x:&:num/space:1
]
def main [
1:space/raw <- new-scope
2:num/raw <- use-scope 1:space/raw
]
+mem: storing 34 in location 2
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