50 lines
1.8 KiB
Rust
50 lines
1.8 KiB
Rust
use wasmtime::Trap;
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pub mod old;
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pub use wasi_common::{WasiCtx, WasiCtxBuilder};
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// Defines a `struct Wasi` with member fields and appropriate APIs for dealing
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// with all the various WASI exports.
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wasmtime_wiggle::define_wasmtime_integration!({
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// The wiggle code to integrate with lives here:
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target: wasi_common::wasi,
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// This must be the same witx document as used above:
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witx: ["../wasi-common/WASI/phases/snapshot/witx/wasi_snapshot_preview1.witx"],
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// This must be the same ctx type as used for the target:
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ctx: WasiCtx,
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// This macro will emit a struct to represent the instance,
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// with this name and docs:
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instance: {
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name: Wasi,
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docs: "An instantiated instance of the wasi exports.
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This represents a wasi module which can be used to instantiate other
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wasm modules. This structure exports all that various fields of the
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wasi instance as fields which can be used to implement your own
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instantiation logic, if necessary. Additionally [`Wasi::get_export`]
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can be used to do name-based resolution."
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}
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});
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pub fn is_wasi_module(name: &str) -> bool {
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// FIXME: this should be more conservative, but while WASI is in flux and
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// we're figuring out how to support multiple revisions, this should do the
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// trick.
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name.starts_with("wasi")
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}
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/// Implement the WASI `proc_exit` function. This function is implemented here
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/// instead of in wasi-common so that we can use the runtime to perform an
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/// unwind rather than exiting the host process.
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fn wasi_proc_exit(status: i32) -> Result<(), Trap> {
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// Check that the status is within WASI's range.
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if status >= 0 && status < 126 {
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Err(Trap::i32_exit(status))
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} else {
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Err(Trap::new(
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"exit with invalid exit status outside of [0..126)",
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))
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}
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}
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