205050 2019-12-09 20:35:33 -0800 Fix the x86_64 probe so that we can get a full stack trace with libunwind and lldb. 2019-12-09 21:04:42 -0800 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 mark.lam mark.lam ews-watchlist keith_miller msaboff saam tzagallo webkit-bug-importer oldest_to_newest 1597100 0 mark.lam 2019-12-09 20:35:33 -0800 Before this patch, the stack trace from inside a probe function is cut off at ctiMasmProbeTrampoline: (lldb) bt * thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0xbbadbeef) ... frame #4: 0x0000000100824607 JavaScriptCore`WTF::Function<void (JSC::Probe::Context&)>::operator(this=0x000000010b88bd00, in=0x00007ffeefbfd400)(JSC::Probe::Context&) const at Function.h:79:35 frame #5: 0x0000000100823996 JavaScriptCore`JSC::stdFunctionCallback(context=0x00007ffeefbfd400) at MacroAssembler.cpp:53:5 frame #6: 0x000000010082701e JavaScriptCore`JSC::Probe::executeProbe(state=0x00007ffeefbfd480) at ProbeContext.cpp:51:5 frame #7: 0x000000010082614b JavaScriptCore`ctiMasmProbeTrampoline + 299 (lldb) After this patch, we'll now get the full stack trace from inside the probe function: (lldb) bt * thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0xbbadbeef) ... frame #4: 0x0000000100826d17 JavaScriptCore`WTF::Function<void (JSC::Probe::Context&)>::operator(this=0x0000000106b878f8, in=0x00007ffeefbfd400)(JSC::Probe::Context&) const at Function.h:79:35 frame #5: 0x0000000100826106 JavaScriptCore`JSC::stdFunctionCallback(context=0x00007ffeefbfd400) at MacroAssembler.cpp:53:5 frame #6: 0x000000010082986e JavaScriptCore`JSC::Probe::executeProbe(state=0x00007ffeefbfd480) at ProbeContext.cpp:51:5 frame #7: 0x00000001008289a2 JavaScriptCore`ctiMasmProbeTrampoline + 338 frame #8: 0x0000466db28025be frame #9: 0x0000000100754ffc JavaScriptCore`llint_entry at LowLevelInterpreter.asm:994 frame #10: 0x0000000100738173 JavaScriptCore`vmEntryToJavaScript at LowLevelInterpreter64.asm:307 frame #11: 0x0000000101489307 JavaScriptCore`JSC::JITCode::execute(this=0x0000000106ba1520, vm=0x0000000106d00000, protoCallFrame=0x00007ffeefbfd9b8) at JITCodeInlines.h:38:38 frame #12: 0x0000000101488982 JavaScriptCore`JSC::Interpreter::executeProgram(this=0x0000000106bfd1f8, source=0x00007ffeefbff090, (null)=0x000000010d0e0000, thisObj=0x000000010d0e8020) at Interpreter.cpp:847:51 frame #13: 0x00000001017d1f9c JavaScriptCore`JSC::evaluate(globalObject=0x000000010d0e0000, source=0x00007ffeefbff090, thisValue=JSValue @ 0x00007ffeefbfef60, returnedException=0x00007ffeefbff0b0) at Completion.cpp:146:38 frame #14: 0x000000010005838f jsc`runWithOptions(globalObject=0x000000010d0e0000, options=0x00007ffeefbff620, success=0x00007ffeefbff48b) at jsc.cpp:2670:35 frame #15: 0x000000010002a0da jsc`jscmain(this=0x00007ffeefbff5a0, vm=0x0000000106d00000, globalObject=0x000000010d0e0000, success=0x00007ffeefbff48b)::$_6::operator()(JSC::VM&, GlobalObject*, bool&) const at jsc.cpp:3157:13 frame #16: 0x0000000100006eff jsc`int runJSC<jscmain(int, char**)::$_6>(options=0x00007ffeefbff620, isWorker=false, func=0x00007ffeefbff5a0)::$_6 const&) at jsc.cpp:3003:9 frame #17: 0x0000000100005988 jsc`jscmain(argc=10, argv=0x00007ffeefbff6c8) at jsc.cpp:3150:18 frame #18: 0x000000010000575e jsc`main(argc=10, argv=0x00007ffeefbff6c8) at jsc.cpp:2498:15 frame #19: 0x00007fff6cfc4da9 libdyld.dylib`start + 1 frame #20: 0x00007fff6cfc4da9 libdyld.dylib`start + 1 (lldb) 1597102 1 385236 mark.lam 2019-12-09 20:42:30 -0800 Created attachment 385236 proposed patch. 1597106 2 385236 msaboff 2019-12-09 20:58:52 -0800 Comment on attachment 385236 proposed patch. r=me 1597107 3 mark.lam 2019-12-09 21:03:43 -0800 Thanks for the review. Landed in r253320: <http://trac.webkit.org/r253320>. 1597108 4 webkit-bug-importer 2019-12-09 21:04:42 -0800 <rdar://problem/57781301> 385236 2019-12-09 20:42:30 -0800 2019-12-09 20:58:52 -0800 proposed patch. bug-205050.patch text/plain 14022 mark.lam SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMjUzMzE5KQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDUxIEBA CisyMDE5LTEyLTA5ICBNYXJrIExhbSAgPG1hcmsubGFtQGFwcGxlLmNvbT4KKworICAgICAgICBG aXggdGhlIHg4Nl82NCBwcm9iZSBzbyB0aGF0IHdlIGNhbiBnZXQgYSBmdWxsIHN0YWNrIHRyYWNl IHdpdGggbGlidW53aW5kIGFuZCBsbGRiLgorICAgICAgICBodHRwczovL2J1Z3Mud2Via2l0Lm9y Zy9zaG93X2J1Zy5jZ2k/aWQ9MjA1MDUwCisKKyAgICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChP T1BTISkuCisKKyAgICAgICAgQmVmb3JlIHRoaXMgcGF0Y2gsIHRoZSBzdGFjayB0cmFjZSBmcm9t 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