wasmtime-cli 43.0.1

Command-line interface for Wasmtime
Documentation 
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

#![cfg(not(miri))]

use super::REALLOC_AND_FREE;
use wasmtime::Result;
use wasmtime::component::*;
use wasmtime::{Module, Store, StoreContextMut};

#[test]
fn top_level_instance_two_level() -> Result<()> {
    let component = r#"
(component
  (import "c" (instance $i
    (export "c" (instance
      (export "m" (core module
        (export "g" (global i32))
      ))
    ))
  ))
  (component $c1
    (import "c" (instance $i
      (export "c" (instance
        (export "m" (core module
          (export "g" (global i32))
        ))
      ))
    ))
    (core module $verify
      (import "" "g" (global i32))
      (func $start
        global.get 0
        i32.const 101
        i32.ne
        if unreachable end
      )

      (start $start)
    )
    (core instance $m (instantiate (module $i "c" "m")))
    (core instance (instantiate $verify (with "" (instance $m))))
  )
  (instance (instantiate $c1 (with "c" (instance $i))))
)
    "#;
    let module = r#"
(module
  (global (export "g") i32 i32.const 101)
)
    "#;

    let engine = super::engine();
    let module = Module::new(&engine, module)?;
    let component = Component::new(&engine, component)?;
    let mut store = Store::new(&engine, ());
    let mut linker = Linker::new(&engine);
    linker.instance("c")?.instance("c")?.module("m", &module)?;
    linker.instantiate(&mut store, &component)?;
    Ok(())
}

#[test]
fn nested_many_instantiations() -> Result<()> {
    let component = r#"
(component
  (import "count" (func $count))
  (component $c1
    (import "count" (func $count))
    (core func $count_lower (canon lower (func $count)))
    (core module $m
        (import "" "" (func $count))
        (start $count)
    )
    (core instance (instantiate $m (with "" (instance (export "" (func $count_lower))))))
    (core instance (instantiate $m (with "" (instance (export "" (func $count_lower))))))
  )
  (component $c2
    (import "count" (func $count))
    (instance (instantiate $c1 (with "count" (func $count))))
    (instance (instantiate $c1 (with "count" (func $count))))
  )
  (component $c3
    (import "count" (func $count))
    (instance (instantiate $c2 (with "count" (func $count))))
    (instance (instantiate $c2 (with "count" (func $count))))
  )
  (component $c4
    (import "count" (func $count))
    (instance (instantiate $c3 (with "count" (func $count))))
    (instance (instantiate $c3 (with "count" (func $count))))
  )

  (instance (instantiate $c4 (with "count" (func $count))))
)
    "#;
    let engine = super::engine();
    let component = Component::new(&engine, component)?;
    let mut store = Store::new(&engine, 0);
    let mut linker = Linker::new(&engine);
    linker
        .root()
        .func_wrap("count", |mut store: StoreContextMut<'_, u32>, _: ()| {
            *store.data_mut() += 1;
            Ok(())
        })?;
    linker.instantiate(&mut store, &component)?;
    assert_eq!(*store.data(), 16);
    Ok(())
}

#[test]
fn thread_options_through_inner() -> Result<()> {
    let component = format!(
        r#"
(component
  (import "hostfn" (func $host (param "a" u32) (result string)))

  (component $c
    (import "hostfn" (func $host (param "a" u32) (result string)))

    (core module $libc
        (memory (export "memory") 1)
        {REALLOC_AND_FREE}
    )
    (core instance $libc (instantiate $libc))

    (core func $host_lower
        (canon lower
            (func $host)
            (memory $libc "memory")
            (realloc (func $libc "realloc"))
        )
    )

    (core module $m
        (import "" "host" (func $host (param i32 i32)))
        (import "libc" "memory" (memory 1))
        (func (export "run") (param i32) (result i32)
            i32.const 42
            i32.const 100
            call $host
            i32.const 100
        )
        (export "memory" (memory 0))
    )
    (core instance $m (instantiate $m
        (with "" (instance (export "host" (func $host_lower))))
        (with "libc" (instance $libc))
    ))

    (func (export "run") (param "a" u32) (result string)
        (canon lift
            (core func $m "run")
            (memory $m "memory")
        )
    )
  )
  (instance $c (instantiate $c (with "hostfn" (func $host))))
  (export "run" (func $c "run"))
)
    "#
    );
    let engine = super::engine();
    let component = Component::new(&engine, component)?;
    let mut store = Store::new(&engine, 0);
    let mut linker = Linker::new(&engine);
    linker
        .root()
        .func_wrap("hostfn", |_, (param,): (u32,)| Ok((param.to_string(),)))?;
    let instance = linker.instantiate(&mut store, &component)?;
    let result = instance
        .get_typed_func::<(u32,), (WasmStr,)>(&mut store, "run")?
        .call(&mut store, (43,))?
        .0;
    assert_eq!(result.to_str(&store)?, "42");
    Ok(())
}