176732 2017-09-11 14:11:10 -0700 Followup (r221805): Address comments and add more tests 2017-09-13 15:00:18 -0700 1 1 1 Unclassified WebKit Images WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=176016 InRadar P2 Normal --- 1 sabouhallawa sabouhallawa buildbot cdumez commit-queue darin dbates japhet simon.fraser thorton webkit-bug-importer oldest_to_newest 1347599 0 sabouhallawa 2017-09-11 14:11:10 -0700 See Darin's comments in https://bugs.webkit.org/show_bug.cgi?id=176016#c15. The new test ensures that multiple decode() promises can be resolved or rejected simultaneously without any issues. 1347605 1 320474 sabouhallawa 2017-09-11 14:14:28 -0700 Created attachment 320474 Patch 1347624 2 webkit-bug-importer 2017-09-11 14:29:43 -0700 <rdar://problem/34376485> 1347769 3 320474 darin 2017-09-11 19:03:13 -0700 Comment on attachment 320474 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=320474&action=review Thanks. This addresses most of my comments. > Source/WebCore/loader/ImageLoader.cpp:402 > for (auto& promise : m_decodingPromises) > - promise->reject(Exception { EncodingError, WTFMove(message) }); > + promise->reject(Exception { EncodingError, message }); I asked this question in the previous patch, and I did not see an answer explaining why this is OK, nor a code change if it’s not OK: Is there something that guarantees we will not reenter this function while rejecting the promises? Can rejecting a promise run arbitrary JavaScript code? What prevents modification of m_decodingPromises while iterating it? > Source/WebCore/platform/graphics/BitmapImage.cpp:544 > + for (auto& decodingCallback : *m_decodingCallbacks) > decodingCallback(); Same question as above: Is there something that guarantees we will not reenter this function while making the callbacks? Can a callback run arbitrary JavaScript code? What prevents modification of m_decodingCallbacks while iterating it? > Source/WebCore/platform/graphics/BitmapImage.cpp:545 > + m_decodingCallbacks->clear(); I suggest deleting the Vector instead. Like this: m_decodingCallbacks = nullptr; Unless perhaps there is some advantage to not deallocating it that I am missing? 1348447 4 320678 sabouhallawa 2017-09-13 12:57:02 -0700 Created attachment 320678 Patch 1348457 5 320474 sabouhallawa 2017-09-13 13:23:23 -0700 Comment on attachment 320474 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=320474&action=review >> Source/WebCore/loader/ImageLoader.cpp:402 >> + promise->reject(Exception { EncodingError, message }); > > I asked this question in the previous patch, and I did not see an answer explaining why this is OK, nor a code change if it’s not OK: > > Is there something that guarantees we will not reenter this function while rejecting the promises? Can rejecting a promise run arbitrary JavaScript code? What prevents modification of m_decodingPromises while iterating it? Part of the Promise implementation is written in JS, please see JavaScriptCore/builtins/PromiseOperations.js. When creating a promise, createResolvingFunctions() is called to create wrappers around the user resolve and reject code blocks. The returned resolve() and reject() functions just call enqueueJob() for the user resolve and reject code blocks. So when ImageLoader::decodeError() calls DeferredPromise::reject(), we end up calling rejectPromise() in PromiseOperations.js which will schedule expecting the user reject code in the next JS execution cycle. If the user reject code has a call to image.decode(), it will not be called until ImageLoader::decodeError() finishes its execution. From looking at the source code and from debugging calling image.decode() from the reject block of another image.decode(), I can confirm that the functions of ImageLoader are not re-enterant. This case is tested by fast/images/decode-static-image-reject.html. 1348507 6 320678 commit-queue 2017-09-13 15:00:17 -0700 Comment on attachment 320678 Patch Clearing flags on attachment: 320678 Committed r221996: <http://trac.webkit.org/changeset/221996> 1348508 7 commit-queue 2017-09-13 15:00:18 -0700 All reviewed patches have been landed. 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