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
|
//@ ignore-lldb
//@ compile-flags:-g
// gdb-command:run
// gdb-command:print stack_unique.value
// gdb-check:$1 = 0
// gdb-command:print stack_unique.next.val.value
// gdb-check:$2 = 1
// gdb-command:print unique_unique.value
// gdb-check:$3 = 2
// gdb-command:print unique_unique.next.val.value
// gdb-check:$4 = 3
// gdb-command:print vec_unique[0].value
// gdb-check:$5 = 6.5
// gdb-command:print vec_unique[0].next.val.value
// gdb-check:$6 = 7.5
// gdb-command:print borrowed_unique.value
// gdb-check:$7 = 8.5
// gdb-command:print borrowed_unique.next.val.value
// gdb-check:$8 = 9.5
// LONG CYCLE
// gdb-command:print long_cycle1.value
// gdb-check:$9 = 20
// gdb-command:print long_cycle1.next.value
// gdb-check:$10 = 21
// gdb-command:print long_cycle1.next.next.value
// gdb-check:$11 = 22
// gdb-command:print long_cycle1.next.next.next.value
// gdb-check:$12 = 23
// gdb-command:print long_cycle2.value
// gdb-check:$13 = 24
// gdb-command:print long_cycle2.next.value
// gdb-check:$14 = 25
// gdb-command:print long_cycle2.next.next.value
// gdb-check:$15 = 26
// gdb-command:print long_cycle3.value
// gdb-check:$16 = 27
// gdb-command:print long_cycle3.next.value
// gdb-check:$17 = 28
// gdb-command:print long_cycle4.value
// gdb-check:$18 = 29.5
// gdb-command:print long_cycle_w_anon_types.value
// gdb-check:$19 = 30
// gdb-command:print long_cycle_w_anon_types.next.val.value
// gdb-check:$20 = 31
// gdb-command:continue
#![allow(unused_variables)]
#![feature(omit_gdb_pretty_printer_section)]
#![omit_gdb_pretty_printer_section]
use self::Opt::{Empty, Val};
use std::boxed::Box as B;
enum Opt<T> {
Empty,
Val { val: T }
}
struct UniqueNode<T> {
next: Opt<Box<UniqueNode<T>>>,
value: T
}
struct LongCycle1<T> {
next: Box<LongCycle2<T>>,
value: T,
}
struct LongCycle2<T> {
next: Box<LongCycle3<T>>,
value: T,
}
struct LongCycle3<T> {
next: Box<LongCycle4<T>>,
value: T,
}
struct LongCycle4<T> {
next: Option<Box<LongCycle1<T>>>,
value: T,
}
struct LongCycleWithAnonymousTypes {
next: Opt<Box<Box<Box<Box<Box<LongCycleWithAnonymousTypes>>>>>>,
value: usize,
}
// This test case makes sure that recursive structs are properly described. The Node structs are
// generic so that we can have a new type (that newly needs to be described) for the different
// cases. The potential problem with recursive types is that the DI generation algorithm gets
// trapped in an endless loop. To make sure, we actually test this in the different cases, we have
// to operate on a new type each time, otherwise we would just hit the DI cache for all but the
// first case.
// The different cases below (stack_*, unique_*, box_*, etc) are set up so that the type description
// algorithm will enter the type reference cycle that is created by a recursive definition from a
// different context each time.
// The "long cycle" cases are constructed to span a longer, indirect recursion cycle between types.
// The different locals will cause the DI algorithm to enter the type reference cycle at different
// points.
fn main() {
let stack_unique: UniqueNode<u16> = UniqueNode {
next: Val {
val: Box::new(UniqueNode {
next: Empty,
value: 1,
})
},
value: 0,
};
let unique_unique: Box<UniqueNode<u32>> = Box::new(UniqueNode {
next: Val {
val: Box::new(UniqueNode {
next: Empty,
value: 3,
})
},
value: 2,
});
let vec_unique: [UniqueNode<f32>; 1] = [UniqueNode {
next: Val {
val: Box::new(UniqueNode {
next: Empty,
value: 7.5,
})
},
value: 6.5,
}];
let borrowed_unique: &UniqueNode<f64> = &UniqueNode {
next: Val {
val: Box::new(UniqueNode {
next: Empty,
value: 9.5,
})
},
value: 8.5,
};
// LONG CYCLE
let long_cycle1: LongCycle1<u16> = LongCycle1 {
next: Box::new(LongCycle2 {
next: Box::new(LongCycle3 {
next: Box::new(LongCycle4 {
next: None,
value: 23,
}),
value: 22,
}),
value: 21
}),
value: 20
};
let long_cycle2: LongCycle2<u32> = LongCycle2 {
next: Box::new(LongCycle3 {
next: Box::new(LongCycle4 {
next: None,
value: 26,
}),
value: 25,
}),
value: 24
};
let long_cycle3: LongCycle3<u64> = LongCycle3 {
next: Box::new(LongCycle4 {
next: None,
value: 28,
}),
value: 27,
};
let long_cycle4: LongCycle4<f32> = LongCycle4 {
next: None,
value: 29.5,
};
// It's important that LongCycleWithAnonymousTypes is encountered only at the end of the
// `box` chain.
let long_cycle_w_anon_types = B::new(B::new(B::new(B::new(B::new(LongCycleWithAnonymousTypes {
next: Val {
val: Box::new(Box::new(Box::new(Box::new(Box::new(LongCycleWithAnonymousTypes {
next: Empty,
value: 31,
})))))
},
value: 30
})))));
zzz(); // #break
}
fn zzz() {()}
|
