Source/JavaScriptCore/builtins/ProxyHelpers.js

/*
 * Copyright (C) 2022 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
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 *    documentation and/or other materials provided with the distribution.
 *
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 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
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@linkTimeConstant
function performProxyObjectGet(target, receiver, handler, propertyName)
{
    "use strict";

    if (handler === null)
        @throwTypeError("Proxy has already been revoked. No more operations are allowed to be performed on it");

    var trap = handler.get;
    if (!@isCallable(trap))
        return @getByValWithThis(target, receiver, propertyName);

    var trapResult = trap.@call(handler, target, propertyName, receiver);

    // FIXME: Add op_get_own_property bytecode and IC, which returns two values, value and attributes.
    // Then we can implement it fully in JS.
    @handleProxyGetTrapResult(trapResult, target, propertyName);

    return trapResult;
}