226872 2021-06-10 04:05:02 -0700 Add WeakHashMap 2021-06-16 17:07:55 -0700 1 1 1 Unclassified WebKit Web Template Framework WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 rniwa rniwa annulen benjamin cdumez cmarcelo darin ews-watchlist fujii ggaren gyuyoung.kim koivisto ryuan.choi sam sergio webkit-bug-importer wenson_hsieh oldest_to_newest 1768503 0 rniwa 2021-06-10 04:05:02 -0700 Add the basic version of WeakHashMap which replies on lazy deletion of key & value. 1768506 1 431061 rniwa 2021-06-10 04:18:01 -0700 Created attachment 431061 Patch 1768581 2 ggaren 2021-06-10 09:44:15 -0700 Pending ews, this approach looks good to me. But I also think we should add a counter, so that after N operations on a weak map, we iterate and clear all nulls. Such a counter maintains the average case amortized O(1) guarantee. And that way, when we talk about the need for a more intrusive way to clear nulls, we’ll compare against the best possible baseline and avoid premature optimization. 1768634 3 rniwa 2021-06-10 11:43:44 -0700 (In reply to Geoffrey Garen from comment #2) > Pending ews, this approach looks good to me. > > But I also think we should add a counter, so that after N operations on a > weak map, we iterate and clear all nulls. Such a counter maintains the > average case amortized O(1) guarantee. And that way, when we talk about the > need for a more intrusive way to clear nulls, we’ll compare against the best > possible baseline and avoid premature optimization. Which operations though? If done natively, that seems like it's gonna bloat the code size everywhere. 1768635 4 431100 rniwa 2021-06-10 11:43:57 -0700 Created attachment 431100 Fixed the builds 1768688 5 ggaren 2021-06-10 13:04:26 -0700 > > But I also think we should add a counter, so that after N operations on a > > weak map, we iterate and clear all nulls. Such a counter maintains the > > average case amortized O(1) guarantee. And that way, when we talk about the > > need for a more intrusive way to clear nulls, we’ll compare against the best > > possible baseline and avoid premature optimization. > > Which operations though? If done natively, that seems like it's gonna bloat > the code size everywhere. My straw man proposal would be all insertion, removal, and lookup operations. If that has a significant impact on code size, my second straw man proposal would be not to mark those functions inline. (I seriously doubt their value as inline functions on modern processors, since the cost is always going to be in the out of line lookup function.) 1768689 6 ggaren 2021-06-10 13:05:08 -0700 Note that I'm proposing an increment, a branch, and a function call. So, yes, a few bytes of code, but not a ton. 1768908 7 431187 rniwa 2021-06-11 04:20:20 -0700 Created attachment 431187 Added amortized deletion 1768965 8 431187 ggaren 2021-06-11 09:27:05 -0700 Comment on attachment 431187 Added amortized deletion r=me 1769150 9 431187 rniwa 2021-06-11 18:42:13 -0700 Comment on attachment 431187 Added amortized deletion Clearing flags on attachment: 431187 Committed r278803 (238760@main): <https://commits.webkit.org/238760@main> 1769151 10 rniwa 2021-06-11 18:42:16 -0700 All reviewed patches have been landed. Closing bug. 1769154 11 webkit-bug-importer 2021-06-11 18:43:37 -0700 <rdar://problem/79227218> 1770478 12 fujii 2021-06-16 17:07:55 -0700 Filed: Bug 227102 – [Win] TestWTF.WTF_WeakPtr.WeakHashMapIterators is crashing 431061 2021-06-10 04:18:01 -0700 2021-06-10 11:43:54 -0700 Patch bug-226872-20210610041800.patch text/plain 54997 rniwa U3VidmVyc2lvbiBSZXZpc2lvbjogMjc4NjI3CmRpZmYgLS1naXQgYS9Tb3VyY2UvV1RGL0NoYW5n ZUxvZyBiL1NvdXJjZS9XVEYvQ2hhbmdlTG9nCmluZGV4IDhkNjlkYzlkNWE1Yjg0MjQ5N2UwNWE2 ZDQ3OWRiZDRjMzM4YjEwNzAuLjc2ZGRlMjIxMjU0ZTI0ODExZTZiYWNlYTc1YzZiMjhhY2Q5ZDI2 OGYgMTAwNjQ0Ci0tLSBhL1NvdXJjZS9XVEYvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9XVEYvQ2hh bmdlTG9nCkBAIC0xLDMgKzEsNDkgQEAKKzIwMjEtMDYtMTAgIFJ5b3N1a2UgTml3YSAgPHJuaXdh QHdlYmtpdC5vcmc+CisKKyAgICAgICAgQWRkIFdlYWtIYXNoTWFwCisgICAgICAgIGh0dHBzOi8v YnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9pZD0yMjY4NzIKKworICAgICAgICBSZXZpZXdl ZCBieSBOT0JPRFkgKE9PUFMhKS4KKworICAgICAgICBBZGRlZCBhIHNpbXBsZSB2ZXJzaW9uIG9m 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