104967 2012-12-13 15:38:44 -0800 javascript integer overflow 2012-12-18 10:08:43 -0800 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) Mac (Intel) OS X 10.7 RESOLVED FIXED P2 Normal --- 0 joecackler fpizlo barraclough fpizlo oliver oldest_to_newest 791022 0 joecackler 2012-12-13 15:38:44 -0800 I stumbled upon a case where it appears that JavaScriptCore's JIT is incorrectly assuming an int32 suffices for a variable that represents a numerical sum. When the sum grows beyond 2^32-1, the value overflows as if 2^32 were subtracted. When I enable Web Inspector, the bug goes away, which I why I suspect the JIT compiler's at fault. I'm on Mac OS 10.7, and I can reproduce the bug consistently on the release version of Safari -- 6.0.2 (7536.26.17) -- as well as on the latest WebKit nightly build. The bug does NOT affect Safari 5. Here's a demonstration: http://jsfiddle.net/T86va/ 793019 1 fpizlo 2012-12-17 14:07:50 -0800 (In reply to comment #0) > I stumbled upon a case where it appears that JavaScriptCore's JIT is incorrectly assuming an int32 suffices for a variable that represents a numerical sum. When the sum grows beyond 2^32-1, the value overflows as if 2^32 were subtracted. When I enable Web Inspector, the bug goes away, which I why I suspect the JIT compiler's at fault. > > I'm on Mac OS 10.7, and I can reproduce the bug consistently on the release version of Safari -- 6.0.2 (7536.26.17) -- as well as on the latest WebKit nightly build. The bug does NOT affect Safari 5. > > Here's a demonstration: http://jsfiddle.net/T86va/ Thanks for reporting this! Seems like a bug creeped into our backwards flow analysis: we always knew that putting a scoped var ('total' is a scoped var in the context of 'total += num') constituted a value escaping, but the format of the PutScopedVar opcode was changed so that the value being put became operand #3 - but the backward flow analysis wasn't updated. This goes wrong because our backward flow analysis tried to optimize situations like: total = (total + num) | 0; In this case, we know that we don't have to detect overflow on 'total + num' because the only user of the plus will truncate to integer anyway. On the other hand, what is supposed to happen for: total = total + num; is that we observe that 'total + num' is used in a context where the value count be observed in an unconstrained way, since 'total' is a scoped variable and is accessible from places not visible to us at time of compilation. But it's this part that was broken because of the backward flow bug. Hence we were assuming that: - Setting total didn't cause the value to escape (because of the bug). - The act of setting total does not by itself observe fractional or bigger-than-int values (technically, this is true). - We could perform the integer add without checking overflow because of the above two assumptions. The fix is just to make sure that the backward flow analysis is updated to treat the operands of PutScopedVar correctly, and flow the fact that child3 (the value being put) is UsedAsValue (i.e. could be used for we-don't-know-what). 793065 2 179809 fpizlo 2012-12-17 15:08:35 -0800 Created attachment 179809 the patch 793069 3 179809 mhahnenberg 2012-12-17 15:10:39 -0800 Comment on attachment 179809 the patch r=me 793070 4 fpizlo 2012-12-17 15:11:50 -0800 Landed in http://trac.webkit.org/changeset/137951 793791 5 joecackler 2012-12-18 10:08:43 -0800 Wow, thanks for the speedy resolution! I've verified that the bug is fixed in r138017. 179809 2012-12-17 15:08:35 -0800 2012-12-17 15:10:39 -0800 the patch intoverflow.patch text/plain 14499 fpizlo SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMTM3OTQ5KQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDE1IEBA CisyMDEyLTEyLTE3ICBGaWxpcCBQaXpsbyAgPGZwaXpsb0BhcHBsZS5jb20+CisKKyAgICAgICAg amF2YXNjcmlwdCBpbnRlZ2VyIG92ZXJmbG93CisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQu b3JnL3Nob3dfYnVnLmNnaT9pZD0xMDQ5NjcKKworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkg KE9PUFMhKS4KKworICAgICAgICBGaXggUHV0U2NvcGVkVmFyIGJhY2t3YXJkIGZsb3cuCisKKyAg ICAgICAgKiBkZmcvREZHUHJlZGljdGlvblByb3BhZ2F0aW9uUGhhc2UuY3BwOgorICAgICAgICAo SlNDOjpERkc6OlByZWRpY3Rpb25Qcm9wYWdhdGlvblBoYXNlOjpwcm9wYWdhdGUpOgorCiAyMDEy 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