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
|
(module
(import "env" "global-1" (global $g1 i32))
(global $g2 (mut i32) (global.get $g1))
(func $foo
(drop (global.get $g1))
(drop (global.get $g2))
)
)
(module
(import "env" "global-1" (global $g1 i32))
(global $g2 (mut i32) (global.get $g1))
(global $g3 (mut i32) (global.get $g2))
(global $g4 (mut i32) (global.get $g3))
(func $foo
(drop (global.get $g1))
(drop (global.get $g2))
(drop (global.get $g3))
(drop (global.get $g4))
)
)
(module
(import "env" "global-1" (global $g1 (mut i32)))
(global $g2 (mut i32) (global.get $g1))
)
(module
(import "env" "global-1" (global $g1 i32))
(global $g2 (mut i32) (global.get $g1))
(func $foo
(global.set $g2 (unreachable))
)
)
(module
(import "env" "global-1" (global $g1 (mut i32)))
(global $g2 (mut i32) (global.get $g1))
(export "global-2" (global $g2))
)
(module
(global $g1 i32 (i32.const 1))
(global $g2 i32 (global.get $g1))
(global $g3 f64 (f64.const -3.4))
(global $g4 (mut f64) (f64.const -2.8))
(global $g5 i32 (i32.const 2))
(global $g6 (mut i32) (global.get $g5))
(global $g7 (mut i32) (i32.const 3))
(global $g8 i32 (global.get $g7))
(global $g9 i32 (i32.const 4))
(global $ga (mut i32) (global.get $g9))
(global $gb (mut i32) (i32.const 5))
(global $gc i32 (global.get $gb))
(func $foo
(drop (global.get $g1))
(drop (global.get $g2))
(drop (global.get $g3))
(drop (global.get $g4))
(drop (global.get $g5))
(drop (global.get $g6))
(drop (global.get $g7))
(drop (global.get $g8))
(drop (global.get $g9))
(drop (global.get $ga))
(drop (global.get $gb))
(drop (global.get $gc))
(global.set $ga (i32.const 6))
(global.set $gb (i32.const 7))
)
)
(module
(global $g1 (mut i32) (i32.const 1))
(global $g2 (mut i32) (i32.const 1))
(func $f (param $x i32) (result i32)
(global.set $g1 (i32.const 100))
(global.set $g2 (local.get $x))
(if (local.get $x) (return (i32.const 0)))
(local.set $x
(i32.add
(global.get $g1)
(global.get $g2)
)
)
(if (local.get $x) (return (i32.const 1)))
(global.set $g1 (i32.const 200))
(global.set $g2 (local.get $x))
(local.set $x
(i32.add
(global.get $g1)
(global.get $g2)
)
)
(local.get $x)
)
)
(module
(global $g1 (mut i32) (i32.const 1))
(global $g2 (mut i32) (i32.const 1))
(func $f (param $x i32) (result i32)
(global.set $g1 (i32.const 100))
(global.set $g2 (local.get $x))
(local.set $x
(i32.add
(i32.add
(global.get $g1)
(global.get $g1)
)
(global.get $g2)
)
)
(local.get $x)
)
)
(module
(global $g1 (mut i32) (i32.const 1))
(global $g2 (mut i32) (i32.const 1))
(func $no (param $x i32) (result i32)
(global.set $g1 (i32.const 100))
(drop (call $no (i32.const 200))) ;; invalidate
(global.get $g1)
)
(func $no2 (param $x i32) (result i32)
(global.set $g1 (i32.const 100))
(global.set $g1 (local.get $x)) ;; invalidate
(global.get $g1)
)
(func $yes (param $x i32) (result i32)
(global.set $g1 (i32.const 100))
(global.set $g2 (local.get $x)) ;; almost invalidate
(global.get $g1)
)
)
;; Reference type tests
(module
(import "env" "global-1" (global $g1 externref))
(global $g2 (mut externref) (global.get $g1))
(global $g3 externref (ref.null extern))
(func $test1
(drop (global.get $g1))
(drop (global.get $g2))
)
(func $test2
(drop (global.get $g3))
)
)
;; Global is used by `set` but never `get` can be eliminated.
(module
(global $write-only (mut i32) (i32.const 1))
(func $foo
(global.set $write-only (i32.const 2))
)
)
|
