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 * (a) the Software, and
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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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 * Software and the Larger Work(s), and to sublicense the foregoing rights on
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package com.oracle.truffle.js.builtins;

import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.object.DynamicObject;
import com.oracle.truffle.js.builtins.WeakRefPrototypeBuiltinsFactory.JSWeakRefDerefNodeGen;
import com.oracle.truffle.js.nodes.function.JSBuiltin;
import com.oracle.truffle.js.nodes.function.JSBuiltinNode;
import com.oracle.truffle.js.runtime.Errors;
import com.oracle.truffle.js.runtime.JSContext;
import com.oracle.truffle.js.runtime.builtins.BuiltinEnum;
import com.oracle.truffle.js.runtime.builtins.JSWeakRef;
import com.oracle.truffle.js.runtime.objects.Undefined;

Contains builtins for JSWeakRef.prototype. /**
 * Contains builtins for {@linkplain JSWeakRef}.prototype.
 */
public final class WeakRefPrototypeBuiltins extends JSBuiltinsContainer.SwitchEnum<WeakRefPrototypeBuiltins.WeakRefPrototype> {

    public static final JSBuiltinsContainer BUILTINS = new WeakRefPrototypeBuiltins();

    protected WeakRefPrototypeBuiltins() {
        super(JSWeakRef.PROTOTYPE_NAME, WeakRefPrototype.class);
    }

    public enum WeakRefPrototype implements BuiltinEnum<WeakRefPrototype> {
        deref(0);

        private final int length;

        WeakRefPrototype(int length) {
            this.length = length;
        }

        @Override
        public int getLength() {
            return length;
        }
    }

    @Override
    protected Object createNode(JSContext context, JSBuiltin builtin, boolean construct, boolean newTarget, WeakRefPrototype builtinEnum) {
        switch (builtinEnum) {
            case deref:
                return JSWeakRefDerefNodeGen.create(context, builtin, args().withThis().createArgumentNodes(context));
        }
        return null;
    }

    public abstract static class JSWeakRefOperation extends JSBuiltinNode {
        public JSWeakRefOperation(JSContext context, JSBuiltin builtin) {
            super(context, builtin);
        }
    }

    
Implementation of the WeakRef.prototype.deref().
/**
     * Implementation of the WeakRef.prototype.deref().
     */
    public abstract static class JSWeakRefDerefNode extends JSWeakRefOperation {

        public JSWeakRefDerefNode(JSContext context, JSBuiltin builtin) {
            super(context, builtin);
        }

        @Specialization(guards = "isJSWeakRef(thisObj)")
        protected DynamicObject deref(DynamicObject thisObj) {
            Object referent = JSWeakRef.getInternalWeakRef(thisObj).get();
            if (referent != null) {
                getContext().addWeakRefTargetToSet(referent);
                return (DynamicObject) referent;
            }
            return Undefined.instance;
        }

        @Specialization(guards = "!isJSWeakRef(thisObj)")
        protected static DynamicObject notWeakRef(@SuppressWarnings("unused") Object thisObj) {
            throw Errors.createTypeError("WeakRef expected");
        }
    }
}