wasmer 7.1.0

High-performance WebAssembly runtime
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
176
177
178

use std::{future::Future, marker::PhantomData, pin::Pin};

use crate::{
    AsyncFunctionEnvMut, HostFunctionKind, RuntimeError, WasmTypeList, WithEnv, WithoutEnv,
    utils::{FromToNativeWasmType, IntoResult},
};

/// Wrapper conveying whether an async host function receives an environment.
pub enum AsyncFunctionEnv<T, Kind> {
    /// Used by host functions without an environment.
    WithoutEnv(PhantomData<(T, Kind)>),
    /// Used by host functions that capture an environment.
    WithEnv(AsyncFunctionEnvMut<T>),
}

impl<T> AsyncFunctionEnv<T, WithoutEnv> {
    /// Create an environment wrapper for functions without host state.
    pub fn new() -> Self {
        Self::WithoutEnv(PhantomData)
    }
}

impl<T> AsyncFunctionEnv<T, WithEnv> {
    /// Create an environment wrapper carrying [`AsyncFunctionEnvMut`].
    pub fn with_env(env: AsyncFunctionEnvMut<T>) -> Self {
        Self::WithEnv(env)
    }

    /// Extract the underlying [`AsyncFunctionEnvMut`].
    pub fn into_env(self) -> AsyncFunctionEnvMut<T> {
        match self {
            Self::WithEnv(env) => env,
            Self::WithoutEnv(_) => unreachable!("with-env async function called without env"),
        }
    }
}

/// Async counterpart to [`HostFunction`](super::host::HostFunction).
pub trait AsyncHostFunction<T, Args, Rets, Kind>
where
    Args: WasmTypeList + 'static,
    Rets: WasmTypeList,
    Kind: HostFunctionKind,
{
    /// Invoke the host function asynchronously.
    fn call_async(
        &self,
        env: AsyncFunctionEnv<T, Kind>,
        args: Args,
    ) -> Pin<Box<dyn Future<Output = Result<Rets, RuntimeError>>>>;
}

macro_rules! impl_async_host_function_without_env {
    ( $( $x:ident ),* ) => {
        impl<$( $x, )* Rets, RetsAsResult, F, Fut > AsyncHostFunction<(), ( $( $x ),* ), Rets, WithoutEnv> for F
        where
            F: Fn($( $x ),*) -> Fut + 'static,
            Fut: Future<Output = RetsAsResult> + 'static,
            RetsAsResult: IntoResult<Rets>,
            Rets: WasmTypeList,
            ( $( $x ),* ): WasmTypeList + 'static,
            $( $x: FromToNativeWasmType + 'static, )*
        {
            fn call_async(
                &self,
                _env: AsyncFunctionEnv<(), WithoutEnv>,
                args: ( $( $x ),* ),
            ) -> Pin<Box<dyn Future<Output = Result<Rets, RuntimeError>>>> {
                #[allow(non_snake_case)]
                let ( $( $x ),* ) = args;
                let fut = (self)( $( $x ),* );
                Box::pin(async move {
                    fut.await
                        .into_result()
                        .map_err(|err| RuntimeError::from_dyn(Box::new(err)))
                })
            }
        }
    };
}

macro_rules! impl_async_host_function_with_env {
    ( $( $x:ident ),* ) => {
        impl<$( $x, )* Rets, RetsAsResult,  T, F, Fut > AsyncHostFunction<T, ( $( $x ),* ), Rets, WithEnv> for F
        where
            T: 'static,
            F: Fn(AsyncFunctionEnvMut<T>, $( $x ),*) -> Fut + 'static,
            Fut: Future<Output = RetsAsResult> + 'static,
            RetsAsResult: IntoResult<Rets>,
            Rets: WasmTypeList,
            ( $( $x ),* ): WasmTypeList + 'static,
            $( $x: FromToNativeWasmType + 'static, )*
        {
            fn call_async(
                &self,
                env: AsyncFunctionEnv<T, WithEnv>,
                args: ( $( $x ),* ),
            ) -> Pin<Box<dyn Future<Output = Result<Rets, RuntimeError>>>> {
                #[allow(non_snake_case)]
                let ( $( $x ),* ) = args;
                let fut = (self)(env.into_env(), $( $x ),* );
                Box::pin(async move {
                    fut.await
                        .into_result()
                        .map_err(|err| RuntimeError::from_dyn(Box::new(err)))
                })
            }
        }
    };
}

impl_async_host_function_without_env!();
impl_async_host_function_without_env!(A1);
impl_async_host_function_without_env!(A1, A2);
impl_async_host_function_without_env!(A1, A2, A3);
impl_async_host_function_without_env!(A1, A2, A3, A4);
impl_async_host_function_without_env!(A1, A2, A3, A4, A5);
impl_async_host_function_without_env!(A1, A2, A3, A4, A5, A6);
impl_async_host_function_without_env!(A1, A2, A3, A4, A5, A6, A7);
impl_async_host_function_without_env!(A1, A2, A3, A4, A5, A6, A7, A8);
impl_async_host_function_without_env!(A1, A2, A3, A4, A5, A6, A7, A8, A9);
impl_async_host_function_without_env!(A1, A2, A3, A4, A5, A6, A7, A8, A9, A10);
impl_async_host_function_without_env!(A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11);
impl_async_host_function_without_env!(A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12);
impl_async_host_function_without_env!(A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13);
impl_async_host_function_without_env!(A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14);
impl_async_host_function_without_env!(
    A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15
);
impl_async_host_function_without_env!(
    A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16
);
impl_async_host_function_without_env!(
    A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17
);
impl_async_host_function_without_env!(
    A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18
);
impl_async_host_function_without_env!(
    A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19
);
impl_async_host_function_without_env!(
    A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20
);

impl_async_host_function_with_env!();
impl_async_host_function_with_env!(A1);
impl_async_host_function_with_env!(A1, A2);
impl_async_host_function_with_env!(A1, A2, A3);
impl_async_host_function_with_env!(A1, A2, A3, A4);
impl_async_host_function_with_env!(A1, A2, A3, A4, A5);
impl_async_host_function_with_env!(A1, A2, A3, A4, A5, A6);
impl_async_host_function_with_env!(A1, A2, A3, A4, A5, A6, A7);
impl_async_host_function_with_env!(A1, A2, A3, A4, A5, A6, A7, A8);
impl_async_host_function_with_env!(A1, A2, A3, A4, A5, A6, A7, A8, A9);
impl_async_host_function_with_env!(A1, A2, A3, A4, A5, A6, A7, A8, A9, A10);
impl_async_host_function_with_env!(A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11);
impl_async_host_function_with_env!(A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12);
impl_async_host_function_with_env!(A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13);
impl_async_host_function_with_env!(A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14);
impl_async_host_function_with_env!(
    A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15
);
impl_async_host_function_with_env!(
    A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16
);
impl_async_host_function_with_env!(
    A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17
);
impl_async_host_function_with_env!(
    A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18
);
impl_async_host_function_with_env!(
    A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19
);
impl_async_host_function_with_env!(
    A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20
);