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 * unmodified Software as contributed to or provided by such licensor, or (ii)
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 * (a) the Software, and
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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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package com.oracle.truffle.js.nodes.access;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.Fallback;
import com.oracle.truffle.api.dsl.GenerateUncached;
import com.oracle.truffle.api.dsl.ImportStatic;
import com.oracle.truffle.api.dsl.NeverDefault;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.object.Shape;
import com.oracle.truffle.js.nodes.JavaScriptBaseNode;
import com.oracle.truffle.js.runtime.builtins.JSProxyObject;
import com.oracle.truffle.js.runtime.objects.JSDynamicObject;
import com.oracle.truffle.js.runtime.objects.JSNonProxyObject;
import com.oracle.truffle.js.runtime.objects.JSObject;
import com.oracle.truffle.js.runtime.objects.JSShape;

/**
 * Implements abstract operation IsExtensible.
 */
@GenerateUncached
@ImportStatic({JSShape.class, CompilerDirectives.class})
public abstract class IsExtensibleNode extends JavaScriptBaseNode {

    protected IsExtensibleNode() {
    }

    public abstract boolean executeBoolean(JSDynamicObject obj);

    @Specialization(guards = {"getJSClass(cachedShape).usesOrdinaryIsExtensible()", "cachedShape.check(object)"}, limit = "1")
    protected static boolean doCachedShape(@SuppressWarnings("unused") JSDynamicObject object,
                    @Cached("object.getShape()") @SuppressWarnings("unused") Shape cachedShape,
                    @Cached(value = "isExtensible(cachedShape)") boolean result) {
        return result;
    }

    static Class getClassIfJSNonProxyObject(Object object) {
        if (object instanceof JSNonProxyObject nonProxyObject) {
            return nonProxyObject.getClass();
        } else {
            return null;
        }
    }

    @Specialization(guards = {"cachedJSClass != null", "isExact(object, cachedJSClass)"}, limit = "1", replaces = "doCachedShape")
    protected static boolean doCachedJSNonProxyClass(JSDynamicObject object,
                    @Cached("getClassIfJSNonProxyObject(object)") Class cachedJSClass) {
        return CompilerDirectives.castExact(object, cachedJSClass).isExtensible();
    }

    @Specialization(replaces = "doCachedJSNonProxyClass")
    protected static boolean doJSNonProxy(JSNonProxyObject object) {
        return object.isExtensible();
    }

    @Specialization
    protected static boolean doJSProxy(JSProxyObject object) {
        return object.isExtensible();
    }

    @Fallback
    protected static boolean doOther(JSDynamicObject object) {
        return JSObject.isExtensible(object);
    }

    @NeverDefault
    public static IsExtensibleNode create() {
        return IsExtensibleNodeGen.create();
    }
}