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Check the signature of host function. (#84)

This commit is contained in:
Sergey Pepyakin 2018-04-18 17:44:10 +03:00 committed by Nikolay Volf
parent 22b260a3b9
commit 5cda9a05da
1 changed files with 8 additions and 0 deletions
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8
src/runner.rs
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@ -107,6 +107,14 @@ impl<'a, E: Externals> Interpreter<'a, E> {
FuncInstanceInternal::Host { ref signature, .. } => {
let args = prepare_function_args(signature, &mut function_context.value_stack);
let return_val = FuncInstance::invoke(&nested_func, &args, self.externals)?;
// Check if `return_val` matches the signature.
let value_ty = return_val.clone().map(|val| val.value_type());
let expected_ty = nested_func.signature().return_type();
if value_ty != expected_ty {
return Err(TrapKind::UnexpectedSignature.into());
}
if let Some(return_val) = return_val {
function_context.value_stack_mut().push(return_val).map_err(Trap::new)?;
}