133182 2014-05-22 08:49:06 -0700 REGRESSION(r154797): Debugger crashes when stepping over an uncaught exception 2014-05-22 14:41:37 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 mark.lam mark.lam ggaren joepeck timothy webkit-bug-importer oldest_to_newest 1010991 0 mark.lam 2014-05-22 08:49:06 -0700 Before r154797, we used to clear the VM exception before calling into the debugger. After r154797, we don’t. This patch will restore this clearing of the exception. 1010992 1 mark.lam 2014-05-22 08:49:50 -0700 <rdar://problem/16520770> 1011033 2 231902 mark.lam 2014-05-22 12:11:23 -0700 Created attachment 231902 the patch. 1011060 3 231902 oliver 2014-05-22 14:30:13 -0700 Comment on attachment 231902 the patch. View in context: https://bugs.webkit.org/attachment.cgi?id=231902&action=review > Source/JavaScriptCore/interpreter/Interpreter.cpp:455 > + ASSERT(!callFrame->hadException()); Why will this assertion not fire? Can't the debugger legitimately cause an unhanded exception? 1011061 4 mark.lam 2014-05-22 14:32:32 -0700 (In reply to comment #3) > (From update of attachment 231902 [details]) > View in context: https://bugs.webkit.org/attachment.cgi?id=231902&action=review > > > Source/JavaScriptCore/interpreter/Interpreter.cpp:455 > > + ASSERT(!callFrame->hadException()); > > Why will this assertion not fire? Can't the debugger legitimately cause an unhanded exception? The inspector is supposed to catch and handle any exceptions thrown in the debugging session. I don’t think there’s currently a way to introduce an exception where there is none. If this changes, we can change this assert in the future. 1011062 5 231902 joepeck 2014-05-22 14:37:17 -0700 Comment on attachment 231902 the patch. View in context: https://bugs.webkit.org/attachment.cgi?id=231902&action=review >>> Source/JavaScriptCore/interpreter/Interpreter.cpp:455 >>> + ASSERT(!callFrame->hadException()); >> >> Why will this assertion not fire? Can't the debugger legitimately cause an unhanded exception? > > The inspector is supposed to catch and handle any exceptions thrown in the debugging session. I don’t think there’s currently a way to introduce an exception where there is none. If this changes, we can change this assert in the future. If the Inspector executes anything on its own behalf (internal implementation details, breakpoint actions, probes, etc) we should be catching and clearing exception information. This assert sounds reasonable to me, and might bring to light a situation in the Inspector where we might not have been cleaning up after ourselves and probably should be. 1011065 6 mark.lam 2014-05-22 14:41:37 -0700 Thanks for the review. Landed in r169221: <http://trac.webkit.org/r169221>. 231902 2014-05-22 12:11:23 -0700 2014-05-22 14:37:17 -0700 the patch. bug-133182.patch text/plain 10525 mark.lam SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMTY5MjA5KQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDI1IEBA CisyMDE0LTA1LTIyICBNYXJrIExhbSAgPG1hcmsubGFtQGFwcGxlLmNvbT4KKworICAgICAgICBS RUdSRVNTSU9OKHIxNTQ3OTcpOiBEZWJ1Z2dlciBjcmFzaGVzIHdoZW4gc3RlcHBpbmcgb3ZlciBh biB1bmNhdWdodCBleGNlcHRpb24uCisgICAgICAgIDxodHRwczovL3dlYmtpdC5vcmcvYi8xMzMx ODI+CisKKyAgICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BTISkuCisKKyAgICAgICAgQmVm b3JlIHIxNTQ3OTcsIHdlIHVzZWQgdG8gY2xlYXIgdGhlIFZNIGV4Y2VwdGlvbiBiZWZvcmUgY2Fs bGluZyBpbnRvIHRoZQorICAgICAgICBkZWJ1Z2dlci4gIEFmdGVyIHIxNTQ3OTcsIHdlIGRvbid0 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