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package com.oracle.graal.python.nodes.call.special;

import com.oracle.graal.python.builtins.objects.function.BuiltinMethodDescriptor;
import com.oracle.graal.python.builtins.objects.type.SpecialMethodSlot;
import com.oracle.graal.python.nodes.attributes.LookupCallableSlotInMRONode;
import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.frame.Frame;
import com.oracle.truffle.api.frame.VirtualFrame;

/**
 * The same as {@link LookupSpecialMethodNode}, but this searches the special slots first. On top of
 * the possible types of return values of {@link LookupSpecialMethodNode}, this node may also return
 * {@link BuiltinMethodDescriptor}, which all the {@link CallBinaryMethodNode} and similar should
 * handle as well.
 */
public abstract class LookupSpecialMethodSlotNode extends LookupSpecialBaseNode {
    protected abstract static class CachedLookup extends LookupSpecialMethodSlotNode {
        protected final SpecialMethodSlot slot;

        public CachedLookup(SpecialMethodSlot slot) {
            this.slot = slot;
        }

        @Specialization
        Object lookup(VirtualFrame frame, Object type, Object receiver,
                        @Cached(parameters = "slot") LookupCallableSlotInMRONode lookupSlot,
                        @Cached MaybeBindDescriptorNode bind) {
            return bind.execute(frame, lookupSlot.execute(type), receiver, type);
        }
    }

    public static LookupSpecialMethodSlotNode create(SpecialMethodSlot slot) {
        return LookupSpecialMethodSlotNodeFactory.CachedLookupNodeGen.create(slot);
    }

    private static final class UncachedLookup extends LookupSpecialMethodSlotNode {
        protected final LookupCallableSlotInMRONode lookup;

        public UncachedLookup(SpecialMethodSlot slot) {
            this.lookup = LookupCallableSlotInMRONode.getUncached(slot);
        }

        @Override
        @TruffleBoundary
        public Object execute(@SuppressWarnings("unused") Frame frame, Object type, Object receiver) {
            return MaybeBindDescriptorNode.getUncached().execute(frame, lookup.execute(type), receiver, type);
        }

        @Override
        public boolean isAdoptable() {
            return false;
        }

        private static final UncachedLookup[] UNCACHEDS = new UncachedLookup[SpecialMethodSlot.values().length];
        static {
            SpecialMethodSlot[] values = SpecialMethodSlot.values();
            for (int i = 0; i < values.length; i++) {
                SpecialMethodSlot slot = values[i];
                UNCACHEDS[i] = new UncachedLookup(slot);
            }
        }
    }

    public static LookupSpecialMethodSlotNode getUncached(SpecialMethodSlot slot) {
        return UncachedLookup.UNCACHEDS[slot.ordinal()];
    }
}
