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
|
//: Containers contain a fixed number of elements of different types.
:(before "End Mu Types Initialization")
//: We'll use this container as a running example, with two integer elements.
type_number point = Type_number["point"] = Next_type_number++;
Type[point].size = 2;
Type[point].kind = container;
Type[point].name = "point";
vector<type_number> i;
i.push_back(integer);
Type[point].elements.push_back(i);
Type[point].elements.push_back(i);
//: Containers can be copied around with a single instruction just like
//: integers, no matter how large they are.
:(scenario copy_multiple_locations)
recipe main [
1:integer <- copy 34:literal
2:integer <- copy 35:literal
3:point <- copy 1:point
]
+run: ingredient 0 is 1
+mem: location 1 is 34
+mem: location 2 is 35
+mem: storing 34 in location 3
+mem: storing 35 in location 4
:(before "End Mu Types Initialization")
// A more complex container, containing another container as one of its
// elements.
type_number point_integer = Type_number["point-integer"] = Next_type_number++;
Type[point_integer].size = 2;
Type[point_integer].kind = container;
Type[point_integer].name = "point-integer";
vector<type_number> p2;
p2.push_back(point);
Type[point_integer].elements.push_back(p2);
vector<type_number> i2;
i2.push_back(integer);
Type[point_integer].elements.push_back(i2);
:(scenario copy_handles_nested_container_elements)
recipe main [
12:integer <- copy 34:literal
13:integer <- copy 35:literal
14:integer <- copy 36:literal
15:point-integer <- copy 12:point-integer
]
+mem: storing 36 in location 17
//: Containers can be checked for equality with a single instruction just like
//: integers, no matter how large they are.
:(scenario compare_multiple_locations)
recipe main [
1:integer <- copy 34:literal # first
2:integer <- copy 35:literal
3:integer <- copy 36:literal
4:integer <- copy 34:literal # second
5:integer <- copy 35:literal
6:integer <- copy 36:literal
7:boolean <- equal 1:point-integer, 4:point-integer
]
+mem: storing 1 in location 7
:(scenario compare_multiple_locations2)
recipe main [
1:integer <- copy 34:literal # first
2:integer <- copy 35:literal
3:integer <- copy 36:literal
4:integer <- copy 34:literal # second
5:integer <- copy 35:literal
6:integer <- copy 37:literal # different
7:boolean <- equal 1:point-integer, 4:point-integer
]
+mem: storing 0 in location 7
:(before "End size_of(types) Cases")
type_info t = Type[types.at(0)];
if (t.kind == container) {
// size of a container is the sum of the sizes of its elements
size_t result = 0;
for (index_t i = 0; i < t.elements.size(); ++i) {
result += size_of(t.elements.at(i));
}
return result;
}
//:: To access elements of a container, use 'get'
:(scenario get)
recipe main [
12:integer <- copy 34:literal
13:integer <- copy 35:literal
15:integer <- get 12:point, 1:offset
]
+run: instruction main/2
+run: ingredient 0 is 12
+run: ingredient 1 is 1
+run: address to copy is 13
+run: its type is 1
+mem: location 13 is 35
+run: product 0 is 15
+mem: storing 35 in location 15
:(before "End Primitive Recipe Declarations")
GET,
:(before "End Primitive Recipe Numbers")
Recipe_number["get"] = GET;
:(before "End Primitive Recipe Implementations")
case GET: {
reagent base = current_instruction().ingredients.at(0);
index_t base_address = base.value;
type_number base_type = base.types.at(0);
assert(Type[base_type].kind == container);
assert(isa_literal(current_instruction().ingredients.at(1)));
assert(ingredients.at(1).size() == 1); // scalar
index_t offset = ingredients.at(1).at(0);
index_t src = base_address;
for (index_t i = 0; i < offset; ++i) {
src += size_of(Type[base_type].elements.at(i));
}
trace("run") << "address to copy is " << src;
assert(Type[base_type].kind == container);
assert(Type[base_type].elements.size() > offset);
type_number src_type = Type[base_type].elements.at(offset).at(0);
trace("run") << "its type is " << src_type;
reagent tmp;
tmp.set_value(src);
tmp.types.push_back(src_type);
products.push_back(read_memory(tmp));
break;
}
//: 'get' requires a literal in ingredient 1. We'll use a synonym called
//: 'offset'.
:(before "End Mu Types Initialization")
Type_number["offset"] = 0;
:(scenario get_handles_nested_container_elements)
recipe main [
12:integer <- copy 34:literal
13:integer <- copy 35:literal
14:integer <- copy 36:literal
15:integer <- get 12:point-integer, 1:offset
]
+run: instruction main/2
+run: ingredient 0 is 12
+run: ingredient 1 is 1
+run: address to copy is 14
+run: its type is 1
+mem: location 14 is 36
+run: product 0 is 15
+mem: storing 36 in location 15
//:: To write to elements of containers, you need their address.
:(scenario get_address)
recipe main [
12:integer <- copy 34:literal
13:integer <- copy 35:literal
15:address:integer <- get-address 12:point, 1:offset
]
+run: instruction main/2
+run: ingredient 0 is 12
+run: ingredient 1 is 1
+run: address to copy is 13
+mem: storing 13 in location 15
:(before "End Primitive Recipe Declarations")
GET_ADDRESS,
:(before "End Primitive Recipe Numbers")
Recipe_number["get-address"] = GET_ADDRESS;
:(before "End Primitive Recipe Implementations")
case GET_ADDRESS: {
reagent base = current_instruction().ingredients.at(0);
index_t base_address = base.value;
type_number base_type = base.types.at(0);
assert(Type[base_type].kind == container);
assert(isa_literal(current_instruction().ingredients.at(1)));
assert(ingredients.at(1).size() == 1); // scalar
index_t offset = ingredients.at(1).at(0);
index_t result = base_address;
for (index_t i = 0; i < offset; ++i) {
result += size_of(Type[base_type].elements.at(i));
}
trace("run") << "address to copy is " << result;
products.resize(1);
products.at(0).push_back(result);
break;
}
|