197765 2019-05-09 20:29:14 -0700 [JSC] String substring operation should return ropes consistently 2019-05-13 16:43:35 -0700 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 ysuzuki ysuzuki ews-watchlist keith_miller mark.lam msaboff saam webkit-bug-importer oldest_to_newest 1534941 0 ysuzuki 2019-05-09 20:29:14 -0700 [JSC] String substring operation should return ropes consistently 1534943 1 369541 ysuzuki 2019-05-09 20:42:34 -0700 Created attachment 369541 Patch 1535046 2 ysuzuki 2019-05-10 10:04:15 -0700 <rdar://problem/37689944> 1535067 3 369564 ysuzuki 2019-05-10 10:41:38 -0700 Created attachment 369564 Patch 1535131 4 369580 ysuzuki 2019-05-10 12:31:51 -0700 Created attachment 369580 Patch 1535136 5 369580 msaboff 2019-05-10 12:45:31 -0700 Comment on attachment 369580 Patch r=me 1535175 6 ysuzuki 2019-05-10 13:49:43 -0700 Committed r245194: <https://trac.webkit.org/changeset/245194> 1535873 7 ysuzuki 2019-05-13 16:43:35 -0700 Ah, my investigation was wrong. While memory reduction is real, the effect comes from the fact that JSRopeString is cheaper than JSString + StringImpl. Not related StringImpl's substring sharing feature. So, maybe, we should just prefer JSRopeString for substring cases. 369541 2019-05-09 20:42:34 -0700 2019-05-10 10:41:37 -0700 Patch bug-197765-20190509204233.patch text/plain 6511 ysuzuki U3VidmVyc2lvbiBSZXZpc2lvbjogMjQ1MTY3CmRpZmYgLS1naXQgYS9Tb3VyY2UvSmF2YVNjcmlw dENvcmUvQ2hhbmdlTG9nIGIvU291cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwppbmRleCA4 ODk1MjM4YTljNDRiOGRhNjY2NTlhOTRhMjBiM2YzMmY0YjU0ZmRiLi4xZmNhZTgxZWI2NzU5ZGE2 NjZhMjg2NGQ0ZjcyODQ4YjYxZmI1MDBmIDEwMDY0NAotLS0gYS9Tb3VyY2UvSmF2YVNjcmlwdENv cmUvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKQEAgLTEs MyArMSwzNCBAQAorMjAxOS0wNS0wOSAgWXVzdWtlIFN1enVraSAgPHlzdXp1a2lAYXBwbGUuY29t PgorCisgICAgICAgIFtKU0NdIFN0cmluZyBzdWJzdHJpbmcgb3BlcmF0aW9uIHNob3VsZCByZXR1 cm4gcm9wZXMgY29uc2lzdGVudGx5CisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3No b3dfYnVnLmNnaT9pZD0xOTc3NjUKKworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMh KS4KKworICAgICAgICBDdXJyZW50bHkgd2UgaGF2ZSBkaWZmZXJlbnQgcG9saWNpZXMgcGVyIHN0 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