188475 2018-08-10 11:03:20 -0700 [IntersectionObserver] Validate threshold values 2018-08-13 15:03:26 -0700 1 1 1 Unclassified WebKit Layout and Rendering WebKit Local Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 159475 1 ajuma ajuma bfulgham commit-queue darin simon.fraser webkit-bug-importer zalan oldest_to_newest 1449321 0 ajuma 2018-08-10 11:03:20 -0700 Throw an exception if any of the thresholds are outside the range [0, 1]. 1449322 1 346912 ajuma 2018-08-10 11:05:55 -0700 Created attachment 346912 Patch 1449682 2 346912 darin 2018-08-13 11:03:50 -0700 Comment on attachment 346912 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=346912&action=review > Source/WebCore/page/IntersectionObserver.cpp:94 > + Vector<double> thresholds; > + if (WTF::holds_alternative<double>(init.threshold)) > + thresholds.append(WTF::get<double>(init.threshold)); > + else > + thresholds = WTF::get<Vector<double>>(WTFMove(init.threshold)); I realize this code is just being moved not newly written, but two thoughts: 1) This kind of thing typically reads better with the "switchOn" style that you can find elsewhere in WebKit code -- makes it clearer all cases are handled even when there are just two cases; it is a little more wordy, though. 2) It is probably slightly more efficient to make the Vector in a way that indicates it will have only one double in it, even though it will be deallocated soon after. One way is to use reserveInitialCapacity(1) and then uncheckedAppend rather than just append. Another way is to write something like "thresholds = Vector<double> { 1, init.threshold }", a third way is "thresholds = Vector<Double> { { threshold } };". All of these have the benefit that the vector capacity will be 1 rather than a larger size as part of optimizing growth. > Source/WebCore/page/IntersectionObserver.cpp:97 > + if (threshold < 0 || threshold > 1) For floating point, it’s typically a good practice to take advantage of the property that "NaN" comparisons all return false, so we would instead write: if (!(threshold >= 0 && threshold <=1)) This would give us an exception when one of the values is a NaN. Perhaps that’s already handled at the bindings layer, though. I think we should make sure we have a test that covers NaN (and infinity and other interesting floating point values like denormalized ones), and then still consider the above syntax since it’s better when NaN is involved and I don’t see a lot of downside to writing it this way. Another consideration is that this approach looks good if we decide put the "validity rule" into a small inline function: if (!isValidThreshold(threshold)) So it’s kind of logical to do the one that has a "not" in it. > LayoutTests/imported/w3c/web-platform-tests/intersection-observer/observer-exceptions-expected.txt:4 > PASS IntersectionObserver constructor witth { rootMargin: "1" } Typo in the test here. 1449756 3 347034 ajuma 2018-08-13 13:47:00 -0700 Created attachment 347034 Patch 1449758 4 346912 ajuma 2018-08-13 13:51:55 -0700 Comment on attachment 346912 Patch Thanks for the review! View in context: https://bugs.webkit.org/attachment.cgi?id=346912&action=review >> Source/WebCore/page/IntersectionObserver.cpp:94 >> + thresholds = WTF::get<Vector<double>>(WTFMove(init.threshold)); > > I realize this code is just being moved not newly written, but two thoughts: > > 1) This kind of thing typically reads better with the "switchOn" style that you can find elsewhere in WebKit code -- makes it clearer all cases are handled even when there are just two cases; it is a little more wordy, though. > > 2) It is probably slightly more efficient to make the Vector in a way that indicates it will have only one double in it, even though it will be deallocated soon after. One way is to use reserveInitialCapacity(1) and then uncheckedAppend rather than just append. Another way is to write something like "thresholds = Vector<double> { 1, init.threshold }", a third way is "thresholds = Vector<Double> { { threshold } };". All of these have the benefit that the vector capacity will be 1 rather than a larger size as part of optimizing growth. 1) Changed to use the switchOn style. 2) Used the reserveInitialCapacity(1) approach. >> Source/WebCore/page/IntersectionObserver.cpp:97 >> + if (threshold < 0 || threshold > 1) > > For floating point, it’s typically a good practice to take advantage of the property that "NaN" comparisons all return false, so we would instead write: > > if (!(threshold >= 0 && threshold <=1)) > > This would give us an exception when one of the values is a NaN. Perhaps that’s already handled at the bindings layer, though. I think we should make sure we have a test that covers NaN (and infinity and other interesting floating point values like denormalized ones), and then still consider the above syntax since it’s better when NaN is involved and I don’t see a lot of downside to writing it this way. > > Another consideration is that this approach looks good if we decide put the "validity rule" into a small inline function: > > if (!isValidThreshold(threshold)) > > So it’s kind of logical to do the one that has a "not" in it. Done. It turns out that Nan and infinity are indeed handled already at the bindings layer, but added test coverage nevertheless. >> LayoutTests/imported/w3c/web-platform-tests/intersection-observer/observer-exceptions-expected.txt:4 >> PASS IntersectionObserver constructor witth { rootMargin: "1" } > > Typo in the test here. Fixed. Fixed it upstream as well. 1449793 5 347034 commit-queue 2018-08-13 15:02:52 -0700 Comment on attachment 347034 Patch Clearing flags on attachment: 347034 Committed r234818: <https://trac.webkit.org/changeset/234818> 1449794 6 commit-queue 2018-08-13 15:02:53 -0700 All reviewed patches have been landed. Closing bug. 1449795 7 webkit-bug-importer 2018-08-13 15:03:26 -0700 <rdar://problem/43254352> 346912 2018-08-10 11:05:55 -0700 2018-08-13 13:46:58 -0700 Patch bug-188475-20180810140554.patch text/plain 5437 ajuma U3VidmVyc2lvbiBSZXZpc2lvbjogMjM0NzYxCmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggMDNmMmMzZWI2ODQ3ODZi MGZhZGFhZmFmMmFiZjY3N2I3ZjM0NDYzOS4uMWI3MDFlYzRkNjEwNmIyYjc1MWQzZDM0ZWYxNDRk ODI2MjBmZjYwOSAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDIwIEBACisyMDE4LTA4LTEwICBBbGkg SnVtYSAgPGFqdW1hQGNocm9taXVtLm9yZz4KKworICAgICAgICBbSW50ZXJzZWN0aW9uT2JzZXJ2 ZXJdIFZhbGlkYXRlIHRocmVzaG9sZCB2YWx1ZXMKKyAgICAgICAgaHR0cHM6Ly9idWdzLndlYmtp dC5vcmcvc2hvd19idWcuY2dpP2lkPTE4ODQ3NQorCisgICAgICAgIFJldmlld2VkIGJ5IE5PQk9E WSAoT09QUyEpLgorCisgICAgICAgIFRocm93IGFuIGV4Y2VwdGlvbiBpZiBhbnkgb2YgYW4gSW50 ZXJzZWN0aW9uT2JzZXJ2ZXIncyB0aHJlc2hvbGRzIGFyZSBvdXRzaWRlCisgICAgICAgIHRoZSBy 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