213593 2020-06-25 00:52:13 -0700 JSCell constructor needs to ensure that the passed in structure is still alive. 2020-06-25 12:33:40 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 mark.lam mark.lam ews-watchlist keith_miller msaboff saam tzagallo webkit-bug-importer ysuzuki oldest_to_newest 1666000 0 mark.lam 2020-06-25 00:52:13 -0700 <rdar://problem/64597573> 1666001 1 402722 mark.lam 2020-06-25 01:14:25 -0700 Created attachment 402722 proposed patch. 1666056 2 402722 ysuzuki 2020-06-25 08:50:55 -0700 Comment on attachment 402722 proposed patch. r=me 1666133 3 mark.lam 2020-06-25 12:03:26 -0700 Offline, Keith and Yusuke questions why Clang would have precomputed Structure field values. Turns out, Clang did not pre-compute the field values. Instead, it pre-computed the address of structure->m_blob where all the field values are contained. As a result, the structure pointer is no longer retained, and GC will not know to keep the structure alive. The fix is still valid. I'll update the comment to indicate that it is the address of structure->m_blob that is pre-computed. 1666149 4 402787 mark.lam 2020-06-25 12:14:51 -0700 Created attachment 402787 patch for landing. 1666165 5 mark.lam 2020-06-25 12:33:40 -0700 Thanks for the review. Landed in r263523: <http://trac.webkit.org/r263523>. 402722 2020-06-25 01:14:25 -0700 2020-06-25 12:14:51 -0700 proposed patch. bug-213593.patch text/plain 4055 mark.lam SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMjYzNTAwKQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDQ1IEBA CisyMDIwLTA2LTI1ICBNYXJrIExhbSAgPG1hcmsubGFtQGFwcGxlLmNvbT4KKworICAgICAgICBK U0NlbGwgY29uc3RydWN0b3IgbmVlZHMgdG8gZW5zdXJlIHRoYXQgdGhlIHBhc3NlZCBpbiBzdHJ1 Y3R1cmUgaXMgc3RpbGwgYWxpdmUuCisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3No b3dfYnVnLmNnaT9pZD0yMTM1OTMKKyAgICAgICAgPHJkYXI6Ly9wcm9ibGVtLzY0NTk3NTczPgor CisgICAgICAgIFJldmlld2VkIGJ5IE5PQk9EWSAoT09QUyEpLgorCisgICAgICAgIE5vdGUgdGhh dCBpbiB0aGUgaW5pdGlhbGl6ZXIgbGlzdCBvZiB0aGUgYEpTQ2VsbChWTSYsIFN0cnVjdHVyZSop 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