ArrayIndexOutOfBoundsException in HostExecuteNode doOverloadedCached with varArgs method and 0 args

[in-fke]

Describe the issue
Regression from 23.0.6 to 23.0.10: ArrayIndexOutOfBoundsException in HostExecuteNode doOverloadedCached (truffle-api) - possibly when var args method is invoked with 0 args.

Steps to reproduce the issue
The class UriBuilder has two methods which are similar
javax.ws.rs.core.UriBuilder.build(Object[], boolean)
and
javax.ws.rs.core.UriBuilder.build(Object...)

My script does.
UriBuilder.fromUri('http://localhost').build();
so I am invoking the second method, which yields ArrayIndexOutOfBoundsException (see details).

Describe GraalVM and your environment:
truffle-api and graal 23.0.10

More details
In this method com.oracle.truffle.host.HostExecuteNode.doOverloadedCached()

And this section:

        int parameterCount = cachedArgTypes.length;
        if (overload.isVarArgs()) {
            seenVargArgs.enter(node);
            Class<?> varArgParamType = overload.getParameterTypes()[parameterCount - 1];
            asVarArgs = !HostToTypeNode.canConvert(node, args[parameterCount - 1], varArgParamType,
                            overload.getGenericParameterTypes()[parameterCount - 1],
                            null, hostContext, HostToTypeNode.COERCE,
                            varArgsMappingInterop, varArgsMappingNode);
        } else {
            asVarArgs = false;
        }

parameterCount is 0 and the line
Class<?> varArgParamType = overload.getParameterTypes()[parameterCount - 1];
runs into ArrayIndexOutOfBoundsException with message "Index -1 out of bounds for length 1".

overload.parameterTypes holds an array [class [Ljava.lang.Object;].

This "used to work" with 23.0.6.

[in-fke]

Any comments on this?
This block:
1b545dc#diff-acdf8822fcfd400b83d5de8ddab5a473e93779789ef2ef1859ca0172b16f198aR157-R276
may be relevant, @chumer ?

[oubidar-Abderrahim]

Hi, thank you for reaching out about this issue, could you please share a full reproducer to this? thanks

[in-fke]

Hi, thank you for reaching out about this issue, could you please share a full reproducer to this? thanks

Sorry, I cannot. Maybe this would be a miminum reproducer for your Unit Tests:

public static class A {
   public void method(Object... args) {
   }
}

and try to eval

new A().method();