package org.simantics.scl.compiler.constants;

import org.cojen.classfile.TypeDesc;
import org.simantics.scl.compiler.internal.codegen.references.Val;
import org.simantics.scl.compiler.internal.codegen.utils.MethodBuilder;
import org.simantics.scl.compiler.types.TVar;
import org.simantics.scl.compiler.types.Type;
import org.simantics.scl.compiler.types.Types;
import org.simantics.scl.compiler.types.kinds.Kinds;

public class FailFunction extends FunctionValue {

    private static final TVar A = Types.var(Kinds.STAR);
    public static final FailFunction INSTANCE = 
            new FailFunction();
    
    private FailFunction() {
        super(new TVar[] {A}, Types.NO_EFFECTS, A, Types.STRING);
    }
    
    private static final TypeDesc RuntimeException = 
            TypeDesc.forClass(RuntimeException.class);
    
    @Override
    public Type applyExact(MethodBuilder mb, Val[] parameters) {
        mb.newObject(RuntimeException);
        mb.dup();
        mb.push(parameters, parameterTypes);
        mb.invokeConstructor(RuntimeException, 
                new TypeDesc[] {TypeDesc.STRING});
        mb.throwObject();
        return getReturnType();
    }

    @Override
    public String toString() {
         return "fail";
    }
}