com.oracle.truffle.js.nodes.array.JSArrayElementIndexNode Maven / Gradle / Ivy

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/*
 * Copyright (c) 2018, 2022, 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
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 * 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
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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package com.oracle.truffle.js.nodes.array;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.js.nodes.JavaScriptBaseNode;
import com.oracle.truffle.js.nodes.access.IsArrayNode;
import com.oracle.truffle.js.runtime.JSConfig;
import com.oracle.truffle.js.runtime.JSContext;
import com.oracle.truffle.js.runtime.array.ScriptArray;
import com.oracle.truffle.js.runtime.builtins.JSArgumentsArray;
import com.oracle.truffle.js.runtime.builtins.JSArray;
import com.oracle.truffle.js.runtime.builtins.JSArrayBufferView;
import com.oracle.truffle.js.runtime.builtins.JSProxy;
import com.oracle.truffle.js.runtime.objects.JSDynamicObject;
import com.oracle.truffle.js.runtime.objects.JSObject;
import com.oracle.truffle.js.runtime.objects.Null;

public abstract class JSArrayElementIndexNode extends JavaScriptBaseNode {
    protected static final int MAX_CACHED_ARRAY_TYPES = 4;
    protected final JSContext context;
    @Child private IsArrayNode isArrayNode;

    protected JSArrayElementIndexNode(JSContext context) {
        this.context = context;
    }

    protected static boolean hasHoles(JSDynamicObject object) {
        return JSObject.getArray(object).hasHoles(object);
    }

    protected static ScriptArray getArrayType(JSDynamicObject object) {
        return JSObject.getArray(object);
    }

    /**
     * Workaround for GR-830: Cached values are initialized before guards are evaluated.
     */
    protected static ScriptArray getArrayTypeIfArray(JSDynamicObject object, boolean isArray) {
        if (!isArray) {
            return null;
        }
        return getArrayType(object);
    }

    protected final boolean isSuitableForEnumBasedProcessingUsingOwnKeys(Object object, long length) {
        return length > JSConfig.BigArrayThreshold && !JSArrayBufferView.isJSArrayBufferView(object) && !JSProxy.isJSProxy(object) &&
                        ((JSArray.isJSArray(object) && context.getArrayPrototypeNoElementsAssumption().isValid()) || !JSDynamicObject.isJSDynamicObject(object) ||
                                        JSObject.getPrototype((JSDynamicObject) object) == Null.instance);
    }

    protected static final boolean isSuitableForEnumBasedProcessing(Object object, long length) {
        if (length <= JSConfig.BigArrayThreshold || !JSDynamicObject.isJSDynamicObject(object)) {
            return false;
        }
        JSDynamicObject chainObject = (JSDynamicObject) object;
        do {
            if (JSArrayBufferView.isJSArrayBufferView(chainObject) || JSProxy.isJSProxy(chainObject)) {
                return false;
            }
            chainObject = JSObject.getPrototype(chainObject);
        } while (chainObject != Null.instance);
        return true;
    }

    /**
     * @param object dummy parameter to force evaluation of the guard by the DSL
     */
    protected final boolean hasPrototypeElements(JSDynamicObject object) {
        return !context.getArrayPrototypeNoElementsAssumption().isValid();
    }

    protected final boolean isArray(Object obj) {
        if (isArrayNode == null) {
            CompilerDirectives.transferToInterpreterAndInvalidate();
            isArrayNode = insert(IsArrayNode.createIsFastOrTypedArray());
        }
        return isArrayNode.execute(obj);
    }

    protected static boolean isSupportedArray(JSDynamicObject object) {
        return JSArray.isJSFastArray(object) || JSArgumentsArray.isJSFastArgumentsObject(object) || JSArrayBufferView.isJSArrayBufferView(object);
    }
}