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
|
- // MIR for `main` before GVN
+ // MIR for `main` after GVN
fn main() -> () {
let mut _0: ();
let _1: std::alloc::Layout;
let mut _2: std::option::Option<std::alloc::Layout>;
let mut _3: *mut u8;
let mut _4: *mut [u8];
let mut _5: std::ptr::NonNull<[u8]>;
let mut _6: std::result::Result<std::ptr::NonNull<[u8]>, std::alloc::AllocError>;
let mut _7: &std::alloc::Global;
let mut _8: std::alloc::Layout;
scope 1 {
debug layout => _1;
let mut _9: &std::alloc::Global;
scope 2 {
debug ptr => _3;
}
scope 5 (inlined <std::alloc::Global as Allocator>::allocate) {
}
scope 6 (inlined #[track_caller] Result::<NonNull<[u8]>, std::alloc::AllocError>::unwrap) {
let mut _12: isize;
let _13: std::alloc::AllocError;
let mut _14: !;
let mut _15: &dyn std::fmt::Debug;
let _16: &std::alloc::AllocError;
scope 7 {
}
scope 8 {
}
}
scope 9 (inlined NonNull::<[u8]>::as_ptr) {
}
}
scope 3 (inlined #[track_caller] Option::<Layout>::unwrap) {
let mut _10: isize;
let mut _11: !;
scope 4 {
}
}
bb0: {
- StorageLive(_1);
+ nop;
StorageLive(_2);
- _2 = Option::<Layout>::None;
+ _2 = const Option::<Layout>::None;
StorageLive(_10);
- _10 = discriminant(_2);
- switchInt(move _10) -> [0: bb2, 1: bb3, otherwise: bb1];
+ _10 = const 0_isize;
+ switchInt(const 0_isize) -> [0: bb2, 1: bb3, otherwise: bb1];
}
bb1: {
unreachable;
}
bb2: {
_11 = option::unwrap_failed() -> unwind unreachable;
}
bb3: {
- _1 = move ((_2 as Some).0: std::alloc::Layout);
+ _1 = const Layout {{ size: Indirect { alloc_id: ALLOC0, offset: Size(8 bytes) }: usize, align: std::ptr::Alignment(Scalar(0x0000000000000000): std::ptr::alignment::AlignmentEnum) }};
StorageDead(_10);
StorageDead(_2);
StorageLive(_3);
StorageLive(_4);
StorageLive(_5);
StorageLive(_6);
StorageLive(_7);
_9 = const main::promoted[0];
_7 = copy _9;
StorageLive(_8);
- _8 = copy _1;
- _6 = std::alloc::Global::alloc_impl(move _7, move _8, const false) -> [return: bb4, unwind unreachable];
+ _8 = const Layout {{ size: Indirect { alloc_id: ALLOC0, offset: Size(8 bytes) }: usize, align: std::ptr::Alignment(Scalar(0x0000000000000000): std::ptr::alignment::AlignmentEnum) }};
+ _6 = std::alloc::Global::alloc_impl(copy _9, const Layout {{ size: Indirect { alloc_id: ALLOC0, offset: Size(8 bytes) }: usize, align: std::ptr::Alignment(Scalar(0x0000000000000000): std::ptr::alignment::AlignmentEnum) }}, const false) -> [return: bb4, unwind unreachable];
}
bb4: {
StorageDead(_8);
StorageDead(_7);
StorageLive(_12);
StorageLive(_16);
_12 = discriminant(_6);
switchInt(move _12) -> [0: bb6, 1: bb5, otherwise: bb1];
}
bb5: {
StorageLive(_15);
_16 = &_13;
_15 = copy _16 as &dyn std::fmt::Debug (PointerCoercion(Unsize, Implicit));
_14 = result::unwrap_failed(const "called `Result::unwrap()` on an `Err` value", move _15) -> unwind unreachable;
}
bb6: {
_5 = move ((_6 as Ok).0: std::ptr::NonNull<[u8]>);
StorageDead(_16);
StorageDead(_12);
StorageDead(_6);
_4 = copy _5 as *mut [u8] (Transmute);
StorageDead(_5);
_3 = copy _4 as *mut u8 (PtrToPtr);
StorageDead(_4);
StorageDead(_3);
- StorageDead(_1);
+ nop;
return;
}
}
- ALLOC0 (size: 43, align: 1) {
+ ALLOC0 (size: 16, align: 8) {
+ 00 00 00 00 00 00 00 00 __ __ __ __ __ __ __ __ │ ........░░░░░░░░
+ }
+
+ ALLOC1 (size: 43, align: 1) {
0x00 │ 63 61 6c 6c 65 64 20 60 52 65 73 75 6c 74 3a 3a │ called `Result::
0x10 │ 75 6e 77 72 61 70 28 29 60 20 6f 6e 20 61 6e 20 │ unwrap()` on an
0x20 │ 60 45 72 72 60 20 76 61 6c 75 65 │ `Err` value
}
|
