[Webkit-unassigned] [Bug 202599] New: InternalFunction::createSubclassStructure should use newTarget's globalObject

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=202599

            Bug ID: 202599
           Summary: InternalFunction::createSubclassStructure should use
                    newTarget's globalObject
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Minor
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: shvaikalesh at gmail.com

Test case:
  var iframe = document.createElement("iframe")
  document.body.appendChild(iframe)
  var other = iframe.contentWindow
  var newTarget = new other.Function()
  newTarget.prototype = null
  var map = Reflect.construct(Map, [], newTarget)
  Object.getPrototypeOf(map) // ?

Expected:
  other.Map.prototype

Actual:
  Map.prototype

ECMA262:
  Step 2 of https://tc39.es/ecma262/#sec-map-iterable
    Step 2 of https://tc39.es/ecma262/#sec-ordinarycreatefromconstructor (constructor is NewTarget)
      Step 4.b of https://tc39.es/ecma262/#sec-getprototypefromconstructor

Test262:
  Tests named "proto-from-ctor-realm*.js", for example: https://test262.report/browse/built-ins/Map/proto-from-ctor-realm.js

Both V8 and SpiderMonkey create subclasses with prototypes from correct realms.

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