60 lines
1.7 KiB
Rust
60 lines
1.7 KiB
Rust
mod wasi;
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use cranelift_codegen::settings;
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use cranelift_native;
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use wasmtime_jit::Context;
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pub fn instantiate<S: AsRef<str>>(
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data: &[u8],
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bin_name: S,
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workspace: Option<S>,
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) -> Result<(), String> {
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// Prepare runtime
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let isa_builder =
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cranelift_native::builder().map_err(|_| "host machine is not a supported target")?;
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let flag_builder = settings::builder();
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let isa = isa_builder.finish(settings::Flags::new(flag_builder));
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let mut context = Context::with_isa(isa);
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let global_exports = context.get_global_exports();
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let get_preopens = |workspace: Option<S>| -> Result<Vec<_>, String> {
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if let Some(workspace) = workspace {
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let preopen_dir = wasi_common::preopen_dir(workspace.as_ref()).map_err(|e| {
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format!(
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"error while preopening directory '{}': {}",
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workspace.as_ref(),
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e
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)
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})?;
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Ok(vec![(".".to_owned(), preopen_dir)])
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} else {
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Ok(vec![])
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}
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};
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context.name_instance(
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"wasi_unstable".to_owned(),
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wasi::instantiate_wasi(
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"",
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global_exports,
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&get_preopens(workspace)?,
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&[bin_name.as_ref().to_owned(), ".".to_owned()],
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&[],
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)
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.expect("instantiating wasi"),
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);
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// Compile and instantiating a wasm module.
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context
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.instantiate_module(None, &data)
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.map(|_| ())
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.map_err(|e| {
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format!(
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"error while processing main module '{}': {}",
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bin_name.as_ref(),
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e
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)
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})
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}
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