wasmtime_test_util/
component.rs

1use arbitrary::Arbitrary;
2use std::mem::MaybeUninit;
3use wasmtime::component::__internal::{
4    CanonicalAbiInfo, InstanceType, InterfaceType, LiftContext, LowerContext,
5};
6use wasmtime::component::{ComponentType, Lift, Lower};
7use wasmtime::{Config, Engine};
8use wasmtime_environ::prelude::*;
9
10pub fn config() -> Config {
11    drop(env_logger::try_init());
12
13    let mut config = Config::new();
14    config.wasm_component_model(true);
15
16    // When `WASMTIME_TEST_NO_HOG_MEMORY` is set it means we're in qemu. The
17    // component model tests create a disproportionate number of instances so
18    // try to cut down on virtual memory usage by avoiding 4G reservations.
19    if std::env::var("WASMTIME_TEST_NO_HOG_MEMORY").is_ok() {
20        config.memory_reservation(0);
21        config.memory_guard_size(0);
22    }
23    config
24}
25
26pub fn engine() -> Engine {
27    Engine::new(&config()).unwrap()
28}
29
30pub fn async_engine() -> Engine {
31    Engine::default()
32}
33
34/// Newtype wrapper for `f32` whose `PartialEq` impl considers NaNs equal to each other.
35#[derive(Copy, Clone, Debug, Arbitrary)]
36pub struct Float32(pub f32);
37
38/// Newtype wrapper for `f64` whose `PartialEq` impl considers NaNs equal to each other.
39#[derive(Copy, Clone, Debug, Arbitrary)]
40pub struct Float64(pub f64);
41
42macro_rules! forward_impls {
43    ($($a:ty => $b:ty,)*) => ($(
44        unsafe impl ComponentType for $a {
45            type Lower = <$b as ComponentType>::Lower;
46
47            const ABI: CanonicalAbiInfo = <$b as ComponentType>::ABI;
48
49            #[inline]
50            fn typecheck(ty: &InterfaceType, types: &InstanceType<'_>) -> Result<()> {
51                <$b as ComponentType>::typecheck(ty, types)
52            }
53        }
54
55        unsafe impl Lower for $a {
56            fn linear_lower_to_flat<U>(
57                &self,
58                cx: &mut LowerContext<'_, U>,
59                ty: InterfaceType,
60                dst: &mut MaybeUninit<Self::Lower>,
61            ) -> Result<()> {
62                <$b as Lower>::linear_lower_to_flat(&self.0, cx, ty, dst)
63            }
64
65            fn linear_lower_to_memory<U>(&self, cx: &mut LowerContext<'_, U>, ty: InterfaceType, offset: usize) -> Result<()> {
66                <$b as Lower>::linear_lower_to_memory(&self.0, cx, ty, offset)
67            }
68        }
69
70        unsafe impl Lift for $a {
71            fn linear_lift_from_flat(cx: &mut LiftContext<'_>, ty: InterfaceType, src: &Self::Lower) -> Result<Self> {
72                Ok(Self(<$b as Lift>::linear_lift_from_flat(cx, ty, src)?))
73            }
74
75            fn linear_lift_from_memory(cx: &mut LiftContext<'_>, ty: InterfaceType, bytes: &[u8]) -> Result<Self> {
76                Ok(Self(<$b as Lift>::linear_lift_from_memory(cx, ty, bytes)?))
77            }
78        }
79
80        impl PartialEq for $a {
81            fn eq(&self, other: &Self) -> bool {
82                self.0 == other.0 || (self.0.is_nan() && other.0.is_nan())
83            }
84        }
85    )*)
86}
87
88forward_impls! {
89    Float32 => f32,
90    Float64 => f64,
91}
wasmtime_test_util/component.rs

wasmtime_test_util/
component.rs
