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/*
 * Copyright (c) 2019, 2023, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * The Universal Permissive License (UPL), Version 1.0
 *
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
 * copyright rights in the Software, and any and all patent rights owned or
 * freely licensable by each licensor hereunder covering either (i) the
 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
 *
 * (a) the Software, and
 *
 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
 * one is included with the Software each a "Larger Work" to which the Software
 * is contributed by such licensors),
 *
 * without restriction, including without limitation the rights to copy, create
 * derivative works of, display, perform, and distribute the Software and make,
 * use, sell, offer for sale, import, export, have made, and have sold the
 * Software and the Larger Work(s), and to sublicense the foregoing rights on
 * either these or other terms.
 *
 * This license is subject to the following condition:
 *
 * The above copyright notice and either this complete permission notice or at a
 * minimum a reference to the UPL must be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * SOFTWARE.
 */
package com.oracle.graal.python.nodes.util;

import com.oracle.graal.python.util.PythonUtils;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.GenerateCached;
import com.oracle.truffle.api.dsl.GenerateInline;
import com.oracle.truffle.api.dsl.GenerateUncached;
import com.oracle.truffle.api.dsl.NeverDefault;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.nodes.ExplodeLoop;
import com.oracle.truffle.api.nodes.Node;

@GenerateUncached
@GenerateInline(inlineByDefault = true)
@GenerateCached
public abstract class SplitArgsNode extends Node {

    public abstract Object[] execute(Node inliningTarget, Object[] varargsWitSelf);

    public final Object[] executeCached(Object[] varargsWitSelf) {
        return execute(this, varargsWitSelf);
    }

    @Specialization(guards = "varargsWithSelf.length == 1")
    static Object[] doEmpty(@SuppressWarnings("unused") Object[] varargsWithSelf) {
        return PythonUtils.EMPTY_OBJECT_ARRAY;
    }

    @Specialization(guards = {"varargsWithSelf.length == cachedLen", "varargsWithSelf.length < 32"}, limit = "3")
    @ExplodeLoop
    static Object[] doCached(Object[] varargsWithSelf,
                    @Cached("varargsWithSelf.length") int cachedLen) {
        Object[] splitArgs = new Object[cachedLen - 1];
        for (int i = 0; i < cachedLen - 1; i++) {
            splitArgs[i] = varargsWithSelf[i + 1];
        }
        return splitArgs;
    }

    @Specialization(replaces = "doCached")
    static Object[] doGeneric(@SuppressWarnings("unused") Object[] varargsWithSelf) {
        Object[] splitArgs = new Object[varargsWithSelf.length - 1];
        PythonUtils.arraycopy(varargsWithSelf, 1, splitArgs, 0, varargsWithSelf.length - 1);
        return splitArgs;
    }

    @NeverDefault
    public static SplitArgsNode create() {
        return SplitArgsNodeGen.create();
    }
}