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Calling matchMedia during a MQL change event will not panic #15495

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merged 1 commit into from Feb 19, 2017
Merged

Calling matchMedia during a MQL change event will not panic #15495

merged 1 commit into from Feb 19, 2017
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@prampey
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prampey commented Feb 10, 2017 •
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Calling matchMedia now leads to a new copy of MQL objects to prevent errors when borrowing references from MQL during an MQL change event.

  • ./mach build -d does not report any errors
  • ./mach test-tidy does not report any errors
  • These changes fix #14967 (github issue number if applicable).
  • There are tests for these changes OR
  • These changes do not require tests because _____

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highfive commented Feb 10, 2017

Heads up! This PR modifies the following files:

  • @fitzgen: components/script/dom/mediaquerylist.rs
  • @KiChjang: components/script/dom/mediaquerylist.rs
@jdm jdm added the S-needs-rebase label Feb 10, 2017
@jdm jdm assigned jdm and unassigned pcwalton Feb 10, 2017
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Great work! Just a couple stylistic comments, and the changes will need to be rebased against master.
tests/wpt/mozilla/tests/mozilla/mql_borrow.html Outdated
<script>
// Test to make sure matchMedia can be suitably used inside MediaQueryList listeners without any errors in borrowing
// mql references
var test = async_test("No clashes found while trying to get a refernce to mql");

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jdm Feb 10, 2017

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"Using matchMedia inside of a MediaQueryList callback does not panic"
tests/wpt/mozilla/tests/mozilla/mql_borrow.html Outdated
assert_not_equals(match3, undefined);
}));
window.resizeTo(600, 400);
}));

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Let's unindent this code to match var test.
components/script/dom/mediaquerylist.rs Outdated
}
// Sending change events for all changed Media Queries
for mql in mql_list.iter()
{

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jdm Feb 10, 2017

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nit: for mql in &mql_list {

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@prampey

prampey Feb 10, 2017

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@jdm For the sake of theory, there is no performance difference between the two right?

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prampey Feb 10, 2017

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Also, I get an error saying that RootedVec doesn't implement the Iterator trait.

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Correct.

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@prampey

prampey Feb 10, 2017

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I get that error for &mql_list. Should I revert back?

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Yes, my mistake. Please keep the { on the same line, though.
components/script/dom/mediaquerylist.rs Outdated
@@ -138,16 +138,24 @@ impl WeakMediaQueryListVec {
/// Evaluate media query lists and report changes
/// https://drafts.csswg.org/cssom-view/#evaluate-media-queries-and-report-changes
pub fn evaluate_and_report_changes(&self) {
for mql in self.cell.borrow().iter() {
rooted_vec!(let mut mql_list);
for mql in self.cell.borrow_mut().iter() {

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Why do we need borrow_mut here?

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@prampey

prampey Feb 10, 2017

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Yeah it works without.
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prampey commented Feb 13, 2017

@jdm Cool. I'm done with the stylistic changes but I seem to be a bit confused when resolving MANIFEST.json.
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jdm commented Feb 13, 2017

@prampey You should be able to revert all changes to MANIFEST.json and run ./mach manifest-update to get a version which is correct.
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prampey commented Feb 15, 2017

@jdm Yes, I already used update-manifest. However while rebasing, the latest commit and my commit seem to have huge differences in code. How do I go about this?
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jdm commented Feb 15, 2017

@prampey Do you mean in MANIFEST.json? My point is that while rebasing you can just resolve merge conflicts in that file by reverting all changes and running update-manifest again, then adding the modified file.
@prampey prampey force-pushed the prampey:mql-borrow-error branch from 1f0d4bc to f846508 Feb 16, 2017
@prampey prampey force-pushed the prampey:mql-borrow-error branch from f846508 to 2369de7 Feb 16, 2017
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prampey commented Feb 16, 2017

@jdm Oh okay, my bad. I pushed in the new changes.
@jdm jdm removed the S-needs-rebase label Feb 16, 2017
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jdm commented Feb 16, 2017

@bors-servo: r+
Thanks a lot for fixing this!
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bors-servo commented Feb 16, 2017

📌 Commit 2369de7 has been approved by jdm
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bors-servo commented Feb 16, 2017

⌛ Testing commit 2369de7 with merge 89b2275...
bors-servo added a commit that referenced this pull request Feb 16, 2017
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Auto merge of #15495 - prampey:mql-borrow-error, r=jdm
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89b2275 
Calling matchMedia during a MQL change event will not panic

<!-- Please describe your changes on the following line: -->
Calling matchMedia now leads to a new copy of MQL objects to prevent errors when borrowing references from MQL during an MQL change event.

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix #14967  (github issue number if applicable).

<!-- Either: -->
- [X] There are tests for these changes OR
- [x] These changes do not require tests because _____

<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/15495)
<!-- Reviewable:end -->
@prampey
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prampey commented Feb 16, 2017 •
edited

@jdm Thanks a lot for bearing with me :) Also, I think it'd be really convenient for developers if we added the documentation link (http://testthewebforward.org/docs/testharness-library.html) in the wpt Readme file. Should I open an issue and send in a PR?
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jdm commented Feb 16, 2017

Please do!
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bors-servo commented Feb 16, 2017

💔 Test failed - mac-rel-wpt2
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jdm commented Feb 17, 2017

I suspect the problem is that resizeTo does not trigger a resize event when running Servo in headless mode. If you resize an iframe instead then I expect it will work. Please file an issue with this test case so we can track the problem with headless mode!
@prampey prampey force-pushed the prampey:mql-borrow-error branch from 2369de7 to 60f5155 Feb 17, 2017
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prampey commented Feb 17, 2017

@jdm Yes, iframes seemed to work. Just pushed in the update.
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jdm commented Feb 17, 2017

@bors-servo: r+
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bors-servo commented Feb 17, 2017

📌 Commit 60f5155 has been approved by jdm
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jdm commented Feb 17, 2017

I filed #15621 about the headless resize issue.
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bors-servo commented Feb 18, 2017

⌛ Testing commit 60f5155 with merge e91f316...
bors-servo added a commit that referenced this pull request Feb 18, 2017
@bors-servo
Auto merge of #15495 - prampey:mql-borrow-error, r=jdm
Loading status checks…
e91f316 
Calling matchMedia during a MQL change event will not panic

<!-- Please describe your changes on the following line: -->
Calling matchMedia now leads to a new copy of MQL objects to prevent errors when borrowing references from MQL during an MQL change event.

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix #14967  (github issue number if applicable).

<!-- Either: -->
- [X] There are tests for these changes OR
- [x] These changes do not require tests because _____

<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/15495)
<!-- Reviewable:end -->
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bors-servo commented Feb 18, 2017

💔 Test failed - mac-dev-unit
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jdm commented Feb 18, 2017

Bah, another manifest-update is necessary :<
@prampey
Calling matchMedia during a MQL change event will not panic
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0c21333
@prampey prampey force-pushed the prampey:mql-borrow-error branch from 60f5155 to 0c21333 Feb 18, 2017
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nox commented Feb 19, 2017

@bors-servo r=jdm
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bors-servo commented Feb 19, 2017

📌 Commit 0c21333 has been approved by jdm
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bors-servo commented Feb 19, 2017

⌛ Testing commit 0c21333 with merge debdebe...
bors-servo added a commit that referenced this pull request Feb 19, 2017
@bors-servo
Auto merge of #15495 - prampey:mql-borrow-error, r=jdm
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debdebe 
Calling matchMedia during a MQL change event will not panic

<!-- Please describe your changes on the following line: -->
Calling matchMedia now leads to a new copy of MQL objects to prevent errors when borrowing references from MQL during an MQL change event.

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix #14967  (github issue number if applicable).

<!-- Either: -->
- [X] There are tests for these changes OR
- [x] These changes do not require tests because _____

<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/15495)
<!-- Reviewable:end -->
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bors-servo commented Feb 19, 2017

☀️ Test successful - android, arm32, arm64, linux-dev, linux-rel-css, linux-rel-wpt, mac-dev-unit, mac-rel-css, mac-rel-wpt1, mac-rel-wpt2, windows-gnu-dev, windows-msvc-dev
Approved by: jdm
Pushing debdebe to master...
@bors-servo bors-servo merged commit 0c21333 into servo:master Feb 19, 2017
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@prampey prampey deleted the prampey:mql-borrow-error branch Feb 22, 2017
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Calling matchMedia during a MQL change event will panic
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