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
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
|
//: Construct types out of their constituent fields.
:(scenario merge)
container foo [
x:num
y:num
]
def main [
1:foo <- merge 3, 4
]
+mem: storing 3 in location 1
+mem: storing 4 in location 2
:(before "End Primitive Recipe Declarations")
MERGE,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "merge", MERGE);
:(before "End Primitive Recipe Checks")
case MERGE: {
// type-checking in a separate transform below
break;
}
:(before "End Primitive Recipe Implementations")
case MERGE: {
products.resize(1);
for (int i = 0; i < SIZE(ingredients); ++i)
for (int j = 0; j < SIZE(ingredients.at(i)); ++j)
products.at(0).push_back(ingredients.at(i).at(j));
break;
}
//: type-check 'merge' to avoid interpreting numbers as addresses
:(scenario merge_check)
def main [
1:point <- merge 3, 4
]
$error: 0
:(scenario merge_check_missing_element)
% Hide_errors = true;
def main [
1:point <- merge 3
]
+error: main: too few ingredients in '1:point <- merge 3'
:(scenario merge_check_extra_element)
% Hide_errors = true;
def main [
1:point <- merge 3, 4, 5
]
+error: main: too many ingredients in '1:point <- merge 3, 4, 5'
//: We want to avoid causing memory corruption, but other than that we want to
//: be flexible in how we construct containers of containers. It should be
//: equally easy to define a container out of primitives or intermediate
//: container fields.
:(scenario merge_check_recursive_containers)
def main [
1:point <- merge 3, 4
1:point-number <- merge 1:point, 5
]
$error: 0
:(scenario merge_check_recursive_containers_2)
% Hide_errors = true;
def main [
1:point <- merge 3, 4
2:point-number <- merge 1:point
]
+error: main: too few ingredients in '2:point-number <- merge 1:point'
:(scenario merge_check_recursive_containers_3)
def main [
1:point-number <- merge 3, 4, 5
]
$error: 0
:(scenario merge_check_recursive_containers_4)
% Hide_errors = true;
def main [
1:point-number <- merge 3, 4
]
+error: main: too few ingredients in '1:point-number <- merge 3, 4'
:(scenario merge_check_reflexive)
% Hide_errors = true;
def main [
1:point <- merge 3, 4
2:point <- merge 1:point
]
$error: 0
//: Since a container can be merged in several ways, we need to be able to
//: backtrack through different possibilities. Later we'll allow creating
//: exclusive containers which contain just one of rather than all of their
//: elements. That will also require backtracking capabilities. Here's the
//: state we need to maintain for backtracking:
:(before "End Types")
struct merge_check_point {
reagent container;
int container_element_index;
merge_check_point(const reagent& c, int i) :container(c), container_element_index(i) {}
};
struct merge_check_state {
stack<merge_check_point> data;
};
:(before "End Checks")
Transform.push_back(check_merge_calls); // idempotent
:(code)
void check_merge_calls(const recipe_ordinal r) {
const recipe& caller = get(Recipe, r);
trace(9991, "transform") << "--- type-check merge instructions in recipe " << caller.name << end();
for (int i = 0; i < SIZE(caller.steps); ++i) {
const instruction& inst = caller.steps.at(i);
if (inst.name != "merge") continue;
if (SIZE(inst.products) != 1) {
raise << maybe(caller.name) << "'merge' should yield a single product in '" << to_original_string(inst) << "'\n" << end();
continue;
}
reagent/*copy*/ product = inst.products.at(0);
// Update product While Type-checking Merge
const type_tree* product_base_type = product.type->atom ? product.type : product.type->left;
assert(product_base_type->atom);
if (product_base_type->value == 0 || !contains_key(Type, product_base_type->value)) {
raise << maybe(caller.name) << "'merge' should yield a container in '" << to_original_string(inst) << "'\n" << end();
continue;
}
const type_info& info = get(Type, product_base_type->value);
if (info.kind != CONTAINER && info.kind != EXCLUSIVE_CONTAINER) {
raise << maybe(caller.name) << "'merge' should yield a container in '" << to_original_string(inst) << "'\n" << end();
continue;
}
check_merge_call(inst.ingredients, product, caller, inst);
}
}
void check_merge_call(const vector<reagent>& ingredients, const reagent& product, const recipe& caller, const instruction& inst) {
int ingredient_index = 0;
merge_check_state state;
state.data.push(merge_check_point(product, 0));
while (true) {
assert(!state.data.empty());
trace("transform") << ingredient_index << " vs " << SIZE(ingredients) << end();
if (ingredient_index >= SIZE(ingredients)) {
raise << maybe(caller.name) << "too few ingredients in '" << to_original_string(inst) << "'\n" << end();
return;
}
reagent& container = state.data.top().container;
if (!container.type) return; // error handled elsewhere
const type_tree* top_root_type = container.type->atom ? container.type : container.type->left;
assert(top_root_type->atom);
type_info& container_info = get(Type, top_root_type->value);
switch (container_info.kind) {
case CONTAINER: {
// degenerate case: merge with the same type always succeeds
if (state.data.top().container_element_index == 0 && types_coercible(container, inst.ingredients.at(ingredient_index)))
return;
const reagent& expected_ingredient = element_type(container.type, state.data.top().container_element_index);
trace("transform") << "checking container " << to_string(container) << " || " << to_string(expected_ingredient) << " vs ingredient " << ingredient_index << end();
// if the current element is the ingredient we expect, move on to the next element/ingredient
if (types_coercible(expected_ingredient, ingredients.at(ingredient_index))) {
++ingredient_index;
++state.data.top().container_element_index;
while (state.data.top().container_element_index >= SIZE(get(Type, get_base_type(state.data.top().container.type)->value).elements)) {
state.data.pop();
if (state.data.empty()) {
if (ingredient_index < SIZE(ingredients))
raise << maybe(caller.name) << "too many ingredients in '" << to_original_string(inst) << "'\n" << end();
return;
}
++state.data.top().container_element_index;
}
}
// if not, maybe it's a field of the current element
else {
// no change to ingredient_index
state.data.push(merge_check_point(expected_ingredient, 0));
}
break;
}
// End check_merge_call Special-cases
default: {
if (!types_coercible(container, ingredients.at(ingredient_index))) {
raise << maybe(caller.name) << "incorrect type of ingredient " << ingredient_index << " in '" << to_original_string(inst) << "'\n" << end();
raise << " (expected '" << debug_string(container) << "')\n" << end();
raise << " (got '" << debug_string(ingredients.at(ingredient_index)) << "')\n" << end();
return;
}
++ingredient_index;
// ++state.data.top().container_element_index; // unnecessary, but wouldn't do any harm
do {
state.data.pop();
if (state.data.empty()) {
if (ingredient_index < SIZE(ingredients))
raise << maybe(caller.name) << "too many ingredients in '" << to_original_string(inst) << "'\n" << end();
return;
}
++state.data.top().container_element_index;
} while (state.data.top().container_element_index >= SIZE(get(Type, get_base_type(state.data.top().container.type)->value).elements));
}
}
}
// never gets here
assert(false);
}
//: replaced in a later layer
//: todo: find some clean way to take this call completely out of this layer
const type_tree* get_base_type(const type_tree* t) {
return t;
}
:(scenario merge_check_product)
% Hide_errors = true;
def main [
1:num <- merge 3
]
+error: main: 'merge' should yield a container in '1:num <- merge 3'
:(before "End Includes")
#include <stack>
using std::stack;
|