private static bool TryTranslateException(Exception original, out Exception translated)
{
if (original.GetType() == typeof(DivideByZeroException))
{
translated = new TrapException(original.Message, TrapException.SpecMessages.IntegerDivideByZero);
return(true);
}
else if (original.GetType() == typeof(OverflowException))
{
translated = new TrapException(original.Message, TrapException.SpecMessages.IntegerOverflow);
return(true);
}
else
{
translated = null;
return(false);
}
}
/// <summary>
/// Invokes the WebAssembly function.
/// </summary>
/// <param name="arguments">The array of arguments to pass to the function.</param>
/// <returns>
/// Returns null if the function has no return value.
/// Returns the value if the function returns a single value.
/// Returns an array of values if the function returns more than one value.
/// </returns>
public object Invoke(params object[] arguments)
{
if (arguments.Length != Parameters.Count)
{
throw new WasmtimeException($"Argument mismatch when invoking function '{Name}': requires {Parameters.Count} but was given {arguments.Length}.");
}
unsafe
{
Interop.wasm_val_t *args = stackalloc Interop.wasm_val_t[Parameters.Count];
Interop.wasm_val_t *results = stackalloc Interop.wasm_val_t[Results.Count];
for (int i = 0; i < arguments.Length; ++i)
{
args[i] = Interop.ToValue(arguments[i], Parameters[i]);
}
var trap = Interop.wasm_func_call(_func, args, results);
if (trap != IntPtr.Zero)
{
throw TrapException.FromOwnedTrap(trap);
}
if (Results.Count == 0)
{
return(null);
}
if (Results.Count == 1)
{
return(Interop.ToObject(&results[0]));
}
var ret = new object[Results.Count];
for (int i = 0; i < Results.Count; ++i)
{
ret[i] = Interop.ToObject(&results[i]);
}
return(ret);
}
}