186 lines
7.2 KiB
C++
186 lines
7.2 KiB
C++
//: Writing to a literal (not computed) address of 0 in a recipe chains two
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//: spaces together. When a variable has a property of /space:1, it looks up
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//: the variable in the chained/surrounding space. /space:2 looks up the
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//: surrounding space of the surrounding space, etc.
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//:
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//: todo: warn on default-space abuse. default-space for one recipe should
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//: never come from another, otherwise memory will be corrupted.
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:(scenario closure)
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def main [
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default-space:space <- new location:type, 30
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2:space/names:new-counter <- new-counter
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10:num/raw <- increment-counter 2:space/names:new-counter
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11:num/raw <- increment-counter 2:space/names:new-counter
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]
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def new-counter [
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default-space:space <- new location:type, 30
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x:num <- copy 23
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y:num <- copy 13 # variable that will be incremented
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return default-space:space
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]
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def increment-counter [
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default-space:space <- new location:type, 30
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0:space/names:new-counter <- next-ingredient # outer space must be created by 'new-counter' above
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y:num/space:1 <- add y:num/space:1, 1 # increment
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y:num <- copy 234 # dummy
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return y:num/space:1
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]
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+name: lexically surrounding space for recipe increment-counter comes from new-counter
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+mem: storing 15 in location 11
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//: To make this work, compute the recipe that provides names for the
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//: surrounding space of each recipe.
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:(before "End Globals")
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map<recipe_ordinal, recipe_ordinal> Surrounding_space; // internal to transform; no need to snapshot
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:(before "End Reset")
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Surrounding_space.clear();
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:(before "Begin Type Modifying Transforms")
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Transform.push_back(collect_surrounding_spaces); // idempotent
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:(code)
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void collect_surrounding_spaces(const recipe_ordinal r) {
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trace(9991, "transform") << "--- collect surrounding spaces for recipe " << get(Recipe, r).name << end();
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for (int i = 0; i < SIZE(get(Recipe, r).steps); ++i) {
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const instruction& inst = get(Recipe, r).steps.at(i);
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if (inst.is_label) continue;
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for (int j = 0; j < SIZE(inst.products); ++j) {
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if (is_literal(inst.products.at(j))) continue;
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if (inst.products.at(j).name != "0") continue;
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if (!is_mu_space(inst.products.at(j))) {
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raise << "slot 0 should always have type address:array:location, but is '" << to_string(inst.products.at(j)) << "'\n" << end();
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continue;
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}
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string_tree* s = property(inst.products.at(j), "names");
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if (!s) {
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raise << "slot 0 requires a /names property in recipe '" << get(Recipe, r).name << "'\n" << end();
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continue;
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}
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if (!s->atom) raise << "slot 0 should have a single value in /names, but got '" << to_string(inst.products.at(j)) << "'\n" << end();
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const string& surrounding_recipe_name = s->value;
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if (surrounding_recipe_name.empty()) {
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raise << "slot 0 doesn't initialize its /names property in recipe '" << get(Recipe, r).name << "'\n" << end();
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continue;
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}
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if (contains_key(Surrounding_space, r)
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&& get(Surrounding_space, r) != get(Recipe_ordinal, surrounding_recipe_name)) {
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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();
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continue;
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}
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trace(9993, "name") << "lexically surrounding space for recipe " << get(Recipe, r).name << " comes from " << surrounding_recipe_name << end();
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if (!contains_key(Recipe_ordinal, surrounding_recipe_name)) {
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raise << "can't find recipe providing surrounding space for '" << get(Recipe, r).name << "'; looking for '" << surrounding_recipe_name << "'\n" << end();
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continue;
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}
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put(Surrounding_space, r, get(Recipe_ordinal, surrounding_recipe_name));
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}
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}
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}
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//: Once surrounding spaces are available, transform_names uses them to handle
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//: /space properties.
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:(replace{} "int lookup_name(const reagent& r, const recipe_ordinal default_recipe)")
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int lookup_name(const reagent& x, const recipe_ordinal default_recipe) {
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if (!has_property(x, "space")) {
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if (Name[default_recipe].empty()) raise << "name not found: " << x.name << '\n' << end();
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return Name[default_recipe][x.name];
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}
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string_tree* p = property(x, "space");
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if (!p || !p->atom) raise << "/space property should have exactly one (non-negative integer) value\n" << end();
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int n = to_integer(p->value);
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assert(n >= 0);
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recipe_ordinal surrounding_recipe = lookup_surrounding_recipe(default_recipe, n);
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if (surrounding_recipe == -1) return -1;
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set<recipe_ordinal> done;
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vector<recipe_ordinal> path;
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return lookup_name(x, surrounding_recipe, done, path);
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}
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// If the recipe we need to lookup this name in doesn't have names done yet,
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// recursively call transform_names on it.
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int lookup_name(const reagent& x, const recipe_ordinal r, set<recipe_ordinal>& done, vector<recipe_ordinal>& path) {
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if (!Name[r].empty()) return Name[r][x.name];
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if (contains_key(done, r)) {
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raise << "can't compute address of '" << to_string(x) << "' because\n" << end();
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for (int i = 1; i < SIZE(path); ++i) {
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raise << path.at(i-1) << " requires computing names of " << path.at(i) << '\n' << end();
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}
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raise << path.at(SIZE(path)-1) << " requires computing names of " << r << "..ad infinitum\n" << end();
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return -1;
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}
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done.insert(r);
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path.push_back(r);
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transform_names(r); // Not passing 'done' through. Might this somehow cause an infinite loop?
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assert(!Name[r].empty());
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return Name[r][x.name];
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}
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recipe_ordinal lookup_surrounding_recipe(const recipe_ordinal r, int n) {
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if (n == 0) return r;
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if (!contains_key(Surrounding_space, r)) {
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raise << "don't know surrounding recipe of '" << get(Recipe, r).name << "'\n" << end();
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return -1;
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}
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assert(contains_key(Surrounding_space, r));
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return lookup_surrounding_recipe(get(Surrounding_space, r), n-1);
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}
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//: weaken use-before-set detection just a tad
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:(replace{} "bool already_transformed(const reagent& r, const map<string, int>& names)")
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bool already_transformed(const reagent& r, const map<string, int>& names) {
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if (has_property(r, "space")) {
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string_tree* p = property(r, "space");
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if (!p || !p->atom) {
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raise << "/space property should have exactly one (non-negative integer) value in '" << r.original_string << "'\n" << end();
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return false;
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}
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if (p->value != "0") return true;
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}
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return contains_key(names, r.name);
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}
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:(scenario missing_surrounding_space)
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% Hide_errors = true;
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def f [
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local-scope
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x:num/space:1 <- copy 34
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]
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+error: don't know surrounding recipe of 'f'
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+error: f: can't find a place to store 'x'
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//: extra test for try_reclaim_locals() from previous layers
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:(scenario local_scope_ignores_nonlocal_spaces)
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def new-scope [
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local-scope
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x:&:num <- new number:type
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*x:&:num <- copy 34
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return default-space:space
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]
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def use-scope [
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local-scope
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outer:space/names:new-scope <- next-ingredient
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0:space/names:new-scope <- copy outer:space
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return *x:&:num/space:1
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]
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def main [
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1:space/raw <- new-scope
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3:num/raw <- use-scope 1:space/raw
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]
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+mem: storing 34 in location 3
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:(scenario recursive_transform_names)
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def foo [
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local-scope
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x:num <- copy 0
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return default-space:space/names:foo
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]
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def main [
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local-scope
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0:space/names:foo <- foo
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x:num/space:1 <- copy 34
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]
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$error: 0
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