about summary refs log tree commit diff stats
path: root/045closure_name.cc
blob: b14030a97bbdb1f405008946470c7e60dd814a50 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
//: 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:address:array:location <- new location:type, 30
  1:address:array:location/names:new-counter <- new-counter
  2:number/raw <- increment-counter 1:address:array:location/names:new-counter
  3:number/raw <- increment-counter 1:address:array:location/names:new-counter
]
def new-counter [
  default-space:address:array:location <- new location:type, 30
  x:number <- copy 23
  y:number <- copy 3  # variable that will be incremented
  return default-space:address:array:location
]
def increment-counter [
  default-space:address:array:location <- new location:type, 30
  0:address:array:location/names:new-counter <- next-ingredient  # outer space must be created by 'new-counter' above
  y:number/space:1 <- add y:number/space:1, 1  # increment
  y:number <- copy 234  # dummy
  return y:number/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();
//?   cerr << "--- collect surrounding spaces for recipe " << get(Recipe, r).name << '\n';
  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:number/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:address:number <- new number:type
  *x:address:number <- copy 34
  return default-space:address:array:location
]
def use-scope [
  local-scope
  outer:address:array:location <- next-ingredient
  0:address:array:location/names:new-scope <- copy outer:address:array:location
  return *x:address:number/space:1
]
def main [
  1:address:array:location/raw <- new-scope
  2:number/raw <- use-scope 1:address:array:location/raw
]
+mem: storing 34 in location 2