[Merged by Bors] - Fix order dependent execution in assignment. #2378
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HalidOdat
added
bug
Test262 conformance changes
Fixed tests (8): |
Codecov Report
@@ Coverage Diff @@
## main #2378 +/- ##
==========================================
+ Coverage 39.59% 39.71% +0.11%
==========================================
Files 307 307
Lines 23394 23437 +43
==========================================
+ Hits 9264 9309 +45
+ Misses 14130 14128 -2
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bors bot
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Oct 29, 2022
This Pull Request implements optional chains.
Example:
```Javascript
const adventurer = {
name: 'Alice',
cat: {
name: 'Dinah'
}
};
console.log(adventurer.cat?.name); // Dinah
console.log(adventurer.dog?.name); // undefined
```
Since I needed to implement `Opcode::RotateLeft`, and #2378 had an implementation for `Opcode::RotateRight`, I took the opportunity to integrate both ops into this PR (big thanks to @HalidOdat for the original implementation!).
This PR almost has 100% conformance for the `optional-chaining` test suite. However, there's this one [test](https://github.com/tc39/test262/blob/85373b4ce12a908f8fc517093d95cf2ed2f5ee6a/test/language/expressions/optional-chaining/member-expression.js) that can't be solved until we properly set function names for function expressions in object and class definitions.
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Hopefully I can rebase and finish this by this weekend or next week. |
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HalidOdat
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raskad,
jasonwilliams,
RageKnify and
Razican
Razican
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Looks good! This was a concerning issue that was blocking a 1.0 issue.
I would add a couple of tests. At least this one:
arr[i++][i++] = i++;Checking that the final length and the values in the array are correct. Also with the example in the PR, so that this doesn't break again :)
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bors r+ |
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Oct 30, 2022
Fixes #1917 (fixes the code example given with the hashes) Fixes the order dependent execution of assignment, so the following code works correctly: ```javascript function f(x) { console.log(x) } // used to check the order of execution let a = [[]] (f(1), a)[(f(2), 0)][(f(3), 0)] = (f(4), 123) // 🤮 ``` Prints out: ```bash 1 2 3 4 123 ``` As expected This introduces some opcodes: - ~~`Swap3`: currently used only to keep some previous code working that needs refactoring.~~ - ~~`RotateRight n`: Rotates the `n` top values from the top of the stack to the right by `1`.~~ Already added by #2390 ~~Besides the new opcodes,~~ Some opcodes pop and push order of values on the stack have been changed. To eliminate many swaps and to make this change easier. ~~This PR is still a WIP and needs more refactoring~~ This is now ready for review/merge :)
RageKnify
approved these changes
Oct 30, 2022
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Pull request successfully merged into main. Build succeeded: |
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Fixes #1917 (fixes the code example given with the hashes)
Fixes the order dependent execution of assignment, so the following code works correctly:
Prints out:
As expected
This introduces some opcodes:
Swap3: currently used only to keep some previous code working that needs refactoring.RotateRight n: Rotates thentop values from the top of the stack to the right by1.Besides the new opcodes,Some opcodes pop and push order of values on the stack have been changed. To eliminate many swaps and to make this change easier.This PR is still a WIP and needs more refactoringThis is now ready for review/merge :)