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package com.oracle.graal.python.nodes.expression;

import com.oracle.graal.python.builtins.objects.PNone;
import com.oracle.graal.python.builtins.objects.PNotImplemented;
import com.oracle.graal.python.nodes.PGuards;
import com.oracle.graal.python.nodes.PNodeWithContext;
import com.oracle.graal.python.nodes.attributes.LookupAttributeInMRONode;
import com.oracle.graal.python.nodes.attributes.LookupCallableSlotInMRONode;
import com.oracle.graal.python.nodes.attributes.LookupInMROBaseNode;
import com.oracle.graal.python.nodes.call.special.CallBinaryMethodNode;
import com.oracle.graal.python.nodes.call.special.LookupAndCallTernaryNode;
import com.oracle.graal.python.nodes.object.GetClassNode;
import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.NodeChild;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.frame.VirtualFrame;

@NodeChild("arg")
@NodeChild("arg2")
@NodeChild("arg3")
public abstract class LookupAndCallInplaceNode extends ExpressionNode {

    public abstract static class NotImplementedHandler extends PNodeWithContext {
        public abstract Object execute(Object arg, Object arg2);
    }

    @Child private CallBinaryMethodNode callBinaryMethodNode;
    @Child private BinaryOpNode binaryOpNode;
    @Child private LookupAndCallTernaryNode lookupAndCallTernaryNode;
    @Child private NotImplementedHandler handler;

    final InplaceArithmetic arithmetic;

    LookupAndCallInplaceNode(InplaceArithmetic arithmetic) {
        this.arithmetic = arithmetic;
    }

    public static LookupAndCallInplaceNode create(InplaceArithmetic arithmetic, ExpressionNode x, ExpressionNode y, ExpressionNode z) {
        return LookupAndCallInplaceNodeGen.create(arithmetic, x, y, z);
    }

    private CallBinaryMethodNode ensureBinaryCallNode() {
        if (callBinaryMethodNode == null) {
            CompilerDirectives.transferToInterpreterAndInvalidate();
            callBinaryMethodNode = insert(CallBinaryMethodNode.create());
        }
        return callBinaryMethodNode;
    }

    private BinaryOpNode ensureLookupAndCallBinaryNode() {
        if (binaryOpNode == null) {
            CompilerDirectives.transferToInterpreterAndInvalidate();
            binaryOpNode = insert(arithmetic.binary.create());
        }
        return binaryOpNode;
    }

    private LookupAndCallTernaryNode ensureLookupAndCallTernaryNode() {
        if (lookupAndCallTernaryNode == null) {
            CompilerDirectives.transferToInterpreterAndInvalidate();
            lookupAndCallTernaryNode = insert(LookupAndCallTernaryNode.createReversible(arithmetic.binaryOpName, null));
        }
        return lookupAndCallTernaryNode;
    }

    public final Object execute(VirtualFrame frame, Object left, Object right) {
        return executeTernary(frame, left, right, PNone.NO_VALUE);
    }

    public abstract Object executeTernary(VirtualFrame frame, Object x, Object y, Object z);

    protected final LookupInMROBaseNode createInplaceLookup() {
        if (arithmetic.slot != null) {
            return LookupCallableSlotInMRONode.create(arithmetic.slot);
        } else {
            return LookupAttributeInMRONode.create(arithmetic.methodName);
        }
    }

    @Specialization
    Object doBinary(VirtualFrame frame, Object left, Object right, Object z,
                    @Cached GetClassNode getClassNode,
                    @Cached("createInplaceLookup()") LookupInMROBaseNode lookupInplace) {
        Object result;
        Object inplaceCallable = lookupInplace.execute(getClassNode.execute(left));
        if (inplaceCallable != PNone.NO_VALUE) {
            // nb.: The only ternary in-place operator is '__ipow__' but according to 'typeobject.c:
            // slot_nb_inplace_power', this is always called as binary.
            result = ensureBinaryCallNode().executeObject(frame, inplaceCallable, left, right);
            if (result != PNotImplemented.NOT_IMPLEMENTED) {
                return result;
            }
        }

        // try non-inplace variant
        boolean isBinary = PGuards.isPNone(z);
        if (isBinary) {
            result = ensureLookupAndCallBinaryNode().executeObject(frame, left, right);
        } else {
            result = ensureLookupAndCallTernaryNode().execute(frame, left, right, z);
        }
        if (result != PNotImplemented.NOT_IMPLEMENTED) {
            return result;
        }
        if (handler == null) {
            CompilerDirectives.transferToInterpreterAndInvalidate();
            handler = insert(arithmetic.notImplementedHandler.get());
        }
        return handler.execute(left, right);
    }
}
