Missing coverage encountered while implementing
<https://github.com/tc39/ecma262/pull/3307> in SpiderMonkey.
Ensure environment lookups are performed in the correct order:
- keyed-destructuring-property-reference-target-evaluation-order-with-bindings.js
Ensure `delete super[elem]` steps are correctly performed:
- delete/super-property-topropertykey.js
- delete/super-property-uninitialized-this.js
Ensure ToPropertyKey for computed property names in object literals
correctly performed:
- object/computed-property-name-topropertykey-before-value-evaluation.js
Ensure `GetSuperBase` is executed before `ToPropertKey`:
- super/prop-expr-getsuperbase-before-topropertykey-*
Ensure `GetThisBinding` is executed first:
- super/prop-expr-uninitialized-this-*
This PR proposes changes to existing test262 tests to allow them to pass under Hardened JavaScript (see Secure ECMAScript proposal and Hardened JavaScript). Moddable uses Hardened JavaScript for JavaScript runtimes on resource constrained embedded devices, including those targeted by ECMA-419.
The changes fall into four groups:
1. Replace use of new Date() with new Date(1970). Scripts running inside a Compartment cannot retrieve the current time, so new Date() throws but new Date(1970) succeeds. Very few tests need the current time, but instead simply need a Date instance.
2. Use Object.defineProperty instead of setting existing built-in properties directly, such as toString and toValue. In Hardened JavaScript, prototypes of built-in objects are frozen. Consequently, setting properties of an instance that exist on the prototype throw (Hardened JavaScript is always in strict mode).
3. Eliminate use of Math.random(). Scripts running inside a Compartment cannot generate random numbers. One test identified so far uses Math.random() in a way that can easily be replaced with a counter.
4. Narrow the scope of exception tests. Consider the following
assert.throws(TypeError, () => {
var s1 = new Date();
s1.toString = Boolean.prototype.toString;
s1.toString();
});
This test passes, but only because new Date() fails by throwing a TypeError. If the invocation of the Date constructor is resolved by (1) above, then the assignment to toString fails as per (2) above. The script should be modified as below to ensure that assert.throws only tests the intended statement, s1.toString(). The modified script tests the intended functionality and passes under Hardened JavaScript
var s1 = new Date(1970);
Object.defineProperty(s1, "toString", {
value: Boolean.prototype.toString
});
assert.throws(TypeError, () => {
s1.toString();
});
This is an initial PR to begin the process of adapting test262 for use with Hardened JavaScript. Further changes are expected, with the vast majority likely to fall into the four groups described above.
Thank you to gibson042, kriskowal, and erights for their advice on this work.
There is no such hidden constructor, it's the same as the hidden
AsyncFunction constructor. In other words:
```js
Object.getPrototypeOf(async () => {}).constructor ===
Object.getPrototypeOf(async function () {}).constructor
```
Also add a test to ensure that %AsyncFunction.prototype% is indeed the
prototype of an async arrow function.
Closes#4044.
* Update test for o[p] = f()
Update S11.13.1_A7_T3.js now that consensus has been reached on https://github.com/tc39/ecma262/pull/3307.
* Rename test and add an analogous one for super.
Based on PR #3807 which had generated these tests from templates,
but was stuck due to issue #3808.
Co-Authored-By: Guillaume Emont <guijemont@igalia.com>
Co-Authored-By: Ioanna M. Dimitriou H <idimitriou@igalia.com>
Hosts are free to throw whatever error they want during module loading: there is no guarantee that the error thrown due to the import with `type: "foo"` is a SyntaxError.
Asumu Takikawa
Nicolò Ribaudo
André Bargull
Théo LUDWIG
Chengzhong Wu
_Kerman
Ron Buckton
Mathias Bynens
Paul Bakker
Aapo Alasuutari
Ioanna M Dimitriou H
Ioanna M Dimitriou H
Jonatan Klemets
Richard Gibson
Peter Hoddie
Linus Groh
Ross Kirsling
Marko Lahma
Ross Kirsling
Shu-yu Guo
Guillaume Emont
Cam Tenny
Lucas Mirelmann
Kevin Gibbons
Michael Dyck
Veera
Daniel Minor