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

import com.oracle.graal.python.builtins.PythonBuiltinClassType;
import com.oracle.graal.python.builtins.objects.function.BuiltinMethodDescriptor.TernaryBuiltinDescriptor;
import com.oracle.graal.python.builtins.objects.function.PBuiltinFunction;
import com.oracle.graal.python.builtins.objects.type.SpecialMethodSlot;
import com.oracle.graal.python.nodes.SpecialMethodNames;
import com.oracle.graal.python.nodes.attributes.LookupAttributeInMRONode;
import com.oracle.graal.python.nodes.function.builtins.PythonTernaryBuiltinNode;
import com.oracle.graal.python.nodes.object.GetClassNode;
import com.oracle.graal.python.runtime.PythonOptions;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.ImportStatic;
import com.oracle.truffle.api.dsl.ReportPolymorphism.Megamorphic;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.frame.VirtualFrame;

// cpython://Objects/abstract.c#ternary_op
// Order operations are tried until either a valid result or error: v.op(v,w,z), w.op(v,w,z), z.op(v,w,z)
@ImportStatic({SpecialMethodNames.class, PythonOptions.class})
public abstract class LookupAndCallNonReversibleTernaryNode extends LookupAndCallTernaryNode {

    LookupAndCallNonReversibleTernaryNode(String name) {
        super(name);
    }

    LookupAndCallNonReversibleTernaryNode(SpecialMethodSlot slot) {
        super(slot);
    }

    protected static PythonBuiltinClassType getBuiltinClass(Object receiver, GetClassNode getClassNode) {
        Object clazz = getClassNode.execute(receiver);
        return clazz instanceof PythonBuiltinClassType ? (PythonBuiltinClassType) clazz : null;
    }

    protected static boolean isClazz(PythonBuiltinClassType clazz, Object receiver, GetClassNode getClassNode) {
        return getClassNode.execute(receiver) == clazz;
    }

    protected final PythonTernaryBuiltinNode getTernaryBuiltin(PythonBuiltinClassType clazz) {
        if (slot != null) {
            Object attribute = slot.getValue(clazz);
            if (attribute instanceof TernaryBuiltinDescriptor) {
                return ((TernaryBuiltinDescriptor) attribute).createNode();
            }
            // If the slot does not contain builtin, full lookup wouldn't find a builtin either
            return null;
        }
        Object attribute = LookupAttributeInMRONode.Dynamic.getUncached().execute(clazz, name);
        if (attribute instanceof PBuiltinFunction) {
            PBuiltinFunction builtinFunction = (PBuiltinFunction) attribute;
            if (PythonTernaryBuiltinNode.class.isAssignableFrom(builtinFunction.getBuiltinNodeFactory().getNodeClass())) {
                return (PythonTernaryBuiltinNode) builtinFunction.getBuiltinNodeFactory().createNode();
            }
        }
        return null;
    }

    @Specialization(guards = {"clazz != null", "function != null", "isClazz(clazz, v, getClassNode)"}, limit = "getCallSiteInlineCacheMaxDepth()")
    static Object callObjectBuiltin(VirtualFrame frame, Object v, Object w, Object z,
                    @SuppressWarnings("unused") @Cached GetClassNode getClassNode,
                    @SuppressWarnings("unused") @Cached("getBuiltinClass(v, getClassNode)") PythonBuiltinClassType clazz,
                    @Cached("getTernaryBuiltin(clazz)") PythonTernaryBuiltinNode function) {
        return function.execute(frame, v, w, z);
    }

    @Specialization(guards = "arg1.getClass() == cachedArg1Class", limit = "getCallSiteInlineCacheMaxDepth()")
    Object callObject(VirtualFrame frame, Object arg1, Object arg2, Object arg3,
                    @SuppressWarnings("unused") @Cached("arg1.getClass()") Class<?> cachedArg1Class,
                    @Cached GetClassNode getClassNode,
                    @Cached("createLookup()") LookupSpecialBaseNode getattr) {
        Object klass = getClassNode.execute(arg1);
        return dispatchNode.execute(frame, getattr.execute(frame, klass, arg1), arg1, arg2, arg3);
    }

    @Specialization(replaces = "callObject")
    @Megamorphic
    Object callObjectMegamorphic(VirtualFrame frame, Object arg1, Object arg2, Object arg3,
                    @Cached GetClassNode getClassNode,
                    @Cached("createLookup()") LookupSpecialBaseNode getattr) {
        Object klass = getClassNode.execute(arg1);
        return dispatchNode.execute(frame, getattr.execute(frame, klass, arg1), arg1, arg2, arg3);
    }
}
