blob: 0626b7ade86506131b6176fbe902561ee5f764ae (
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
|
// Support for records.
:(before "End Mu Types")
// We'll use this record as a running example, with two fields: an integer and
// a boolean.
int integer_boolean = Type_number["integer-boolean"] = Next_type_number++;
Type[integer_boolean].size = 2;
Type[integer_boolean].is_record = true;
vector<type_number> i;
i.push_back(integer);
Type[integer_boolean].elements.push_back(i);
vector<type_number> b;
b.push_back(boolean);
Type[integer_boolean].elements.push_back(b);
:(scenario copy_multiple_locations)
# Records can be copied around with a single instruction just like integers,
# no matter how large they are.
recipe main [
1:integer <- copy 34:literal
2:boolean <- copy 0:literal
3:integer-boolean <- copy 1:integer-boolean
]
+run: ingredient 0 is 1
+mem: location 1 is 34
+mem: location 2 is 0
+mem: storing in location 3
+mem: storing in location 4
:(before "End Globals")
// Operator to look at fields of records.
const int GET = 18;
:(before "End Primitive Recipe Numbers")
Recipe_number["get"] = GET;
Next_recipe_number++;
:(before "End Primitive Recipe Implementations")
case GET: {
trace("run") << "ingredient 0 is " << instructions[pc].ingredients[0].name;
int base_address = to_int(instructions[pc].ingredients[0].name);
trace("run") << "base address " << base_address;
int base_type = instructions[pc].ingredients[0].types[0];
trace("run") << "base type is " << base_type;
trace("run") << "ingredient 1 is " << instructions[pc].ingredients[1].name;
assert(instructions[pc].ingredients[1].types.size() == 1);
assert(instructions[pc].ingredients[1].types[0] == 0); // must be literal
size_t offset = to_int(instructions[pc].ingredients[1].name);
int src = base_address+offset;
trace("run") << "address to copy is " << src;
assert(Type[base_type].is_record);
assert(Type[base_type].elements.size() > offset);
int src_type = Type[base_type].elements[offset][0];
trace("run") << "its type is " << src_type;
ostringstream s;
s << src;
reagent tmp(s.str());
tmp.types.push_back(src_type);
vector<int> result(read_memory(tmp));
trace("run") << "product 0 is " << result[0];
write_memory(instructions[pc].products[0], result);
break;
}
:(scenario "get")
recipe main [
12:integer <- copy 34:literal
13:boolean <- copy 0:literal
15:boolean <- get 12:integer-boolean, 1:offset
]
+run: instruction 2
+run: ingredient 0 is 12
+run: base address 12
+run: ingredient 1 is 1
+run: address to copy is 13
+run: its type is 3
+mem: location 13 is 0
+run: product 0 is 0
+mem: storing in location 15
:(before "End Globals")
// To write to fields of records, you need their address.
const int GET_ADDRESS = 19;
:(before "End Primitive Recipe Numbers")
Recipe_number["get-address"] = GET_ADDRESS;
Next_recipe_number++;
:(before "End Primitive Recipe Implementations")
case GET_ADDRESS: {
trace("run") << "ingredient 0 is " << instructions[pc].ingredients[0].name;
int base_address = to_int(instructions[pc].ingredients[0].name);
trace("run") << "base address " << base_address;
int base_type = instructions[pc].ingredients[0].types[0];
trace("run") << "base type is " << base_type;
trace("run") << "ingredient 1 is " << instructions[pc].ingredients[1].name;
assert(instructions[pc].ingredients[1].types.size() == 1);
assert(instructions[pc].ingredients[1].types[0] == 0); // must be literal
size_t offset = to_int(instructions[pc].ingredients[1].name);
int src = base_address+offset;
trace("run") << "address to copy is " << src;
vector<int> result;
result.push_back(src);
trace("run") << "product 0 is " << result[0];
write_memory(instructions[pc].products[0], result);
break;
}
:(scenario "get_address")
recipe main [
12:integer <- copy 34:literal
13:boolean <- copy 0:literal
15:address:integer <- get-address 12:integer-boolean, 1:offset
]
+run: instruction 2
+run: ingredient 0 is 12
+run: base address 12
+run: ingredient 1 is 1
+run: address to copy is 13
+mem: storing in location 15
|