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feat(api) Function::native returns a Result.

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This patch updates `Function::native` to return a `Result` rather than
an `Option`.
This commit is contained in:
Ivan Enderlin
2020-06-18 15:28:08 +02:00
parent bf5259fb31
commit 4a5ce43787
2 changed files with 30 additions and 10 deletions
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38
lib/api/src/externals/function.rs vendored
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@@ -300,22 +300,42 @@ impl Function {
}
}
pub fn native<'a, Args, Rets>(&self) -> Option<NativeFunc<'a, Args, Rets>>
/// Transform this WebAssembly function into a function with the
/// native ABI. See `NativeFunc` to learn more.
pub fn native<'a, Args, Rets>(&self) -> Result<NativeFunc<'a, Args, Rets>, RuntimeError>
where
Args: WasmTypeList,
Rets: WasmTypeList,
{
// type check
if self.exported.signature.params() != Args::wasm_types() {
// todo: error param types don't match
return None;
}
if self.exported.signature.results() != Rets::wasm_types() {
// todo: error result types don't match
return None;
{
let expected = self.exported.signature.params();
let given = Args::wasm_types();
if expected != given {
return Err(RuntimeError::new(format!(
"given types (`{:?}`) for the function arguments don't match the actual types (`{:?}`)",
given,
expected,
)));
}
}
Some(NativeFunc::new(
{
let expected = self.exported.signature.results();
let given = Rets::wasm_types();
if expected != given {
// todo: error result types don't match
return Err(RuntimeError::new(format!(
"given types (`{:?}`) for the function results don't match the actual types (`{:?}`)",
given,
expected,
)));
}
}
Ok(NativeFunc::new(
self.store.clone(),
self.exported.address,
self.exported.vmctx,