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40 lines
1.7 KiB
JavaScript
40 lines
1.7 KiB
JavaScript
// Copyright (C) 2017 André Bargull. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-function-calls-runtime-semantics-evaluation
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description: >
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Check TypeError is thrown from correct realm with tco-call to class constructor from derived
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class [[Construct]] invocation.
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info: |
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12.3.4.3 Runtime Semantics: EvaluateDirectCall( func, thisValue, arguments, tailPosition )
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...
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4. If tailPosition is true, perform PrepareForTailCall().
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5. Let result be Call(func, thisValue, argList).
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6. Assert: If tailPosition is true, the above call will not return here, but instead evaluation will continue as if the following return has already occurred.
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7. Assert: If result is not an abrupt completion, then Type(result) is an ECMAScript language type.
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8. Return result.
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9.2.1 [[Call]] ( thisArgument, argumentsList)
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...
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2. If F.[[FunctionKind]] is "classConstructor", throw a TypeError exception.
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3. Let callerContext be the running execution context.
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4. Let calleeContext be PrepareForOrdinaryCall(F, undefined).
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5. Assert: calleeContext is now the running execution context.
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...
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features: [tail-call-optimization, class]
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---*/
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// - The class constructor call is in a valid tail-call position, which means PrepareForTailCall is performed.
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// - The function call returns from `otherRealm` and proceeds the tail-call in this realm.
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// - Calling the class constructor throws a TypeError from the current realm, that means this realm and not `otherRealm`.
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var code = "(class { constructor() { return (class {})(); } });";
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var otherRealm = $262.createRealm();
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var tco = otherRealm.evalScript(code);
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assert.throws(TypeError, function() {
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new tco();
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});
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