175812 2017-08-21 22:31:16 -0700 We are using valueProfileForBytecodeOffset when there may not be a value profile 2017-08-22 09:29:04 -0700 1 1 1 Unclassified WebKit JavaScriptCore Safari Technology Preview Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 saam saam benjamin fpizlo ggaren gskachkov jfbastien keith_miller mark.lam msaboff rmorisset ticaiolima webkit-bug-importer ysuzuki oldest_to_newest 1340962 0 saam 2017-08-21 22:31:16 -0700 Currently, switching to this crashes on stress/inlined-tail-call-in-inlined-setter-should-not-crash-when-getting-value-profile.js ValueProfile* CodeBlock::valueProfileForBytecodeOffset(int bytecodeOffset) { OpcodeID opcodeID = Interpreter::getOpcodeID(instructions()[bytecodeOffset]); unsigned length = opcodeLength(opcodeID); ValueProfile* result = instructions()[bytecodeOffset + length - 1].u.profile; #if !ASSERT_DISABLED bool found = false; for (unsigned i = 0; i < numberOfValueProfiles(); ++i) { ValueProfile* profile = valueProfile(i); if (profile->m_bytecodeOffset == bytecodeOffset) { ASSERT(profile == result); found = true; break; } } ASSERT(found); #endif return result; } I'll fix and land this change 1340968 1 saam 2017-08-21 23:09:27 -0700 I'm moving to two functions: ValueProfile& valueProfileForBytecodeOffset(int); ValueProfile* tryGetValueProfileForBytecodeOffset(int); 1340974 2 318740 saam 2017-08-21 23:40:42 -0700 Created attachment 318740 patch 1341048 3 318740 msaboff 2017-08-22 07:26:19 -0700 Comment on attachment 318740 patch View in context: https://bugs.webkit.org/attachment.cgi?id=318740&action=review r=me with the suggested build fix. > Source/JavaScriptCore/jit/JITInlines.h:974 > ASSERT(valueProfile); Looks like this line needs to be removed to fix the Debug build. 1341073 4 saam 2017-08-22 09:28:33 -0700 landed in: https://trac.webkit.org/changeset/221018/webkit 1341074 5 webkit-bug-importer 2017-08-22 09:29:04 -0700 <rdar://problem/34014145> 318740 2017-08-21 23:40:42 -0700 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