122255 2013-10-02 18:33:14 -0700 Make LLINT exception stack unwinding consistent with the JIT 2013-10-02 19:43:43 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 mark.lam mark.lam fpizlo ggaren mhahnenberg msaboff oliver oldest_to_newest 935633 0 mark.lam 2013-10-02 18:33:14 -0700 Currently, if you build a debug build and run the layout test fast/workers/stress-js-execution.html, you will see an assertion failure: ASSERTION FAILED: !isTornOff() /Volumes/Data/ws7/OpenSource/Source/JavaScriptCore/runtime/JSActivation.h(144) : void JSC::JSActivation::tearOff(JSC::VM &) 1 0x1078056a0 WTFCrash 2 0x10756c401 JSC::JSActivation::tearOff(JSC::VM&) 3 0x107569aac JSC::unwindCallFrame(JSC::StackVisitor&, JSC::JSValue) 4 0x10756c1e6 JSC::UnwindFunctor::operator()(JSC::StackVisitor&) 5 0x10756c0ba void JSC::StackVisitor::visit<JSC::UnwindFunctor>(JSC::ExecState*, JSC::UnwindFunctor&) 6 0x10756ab9d void JSC::ExecState::iterate<JSC::UnwindFunctor>(JSC::UnwindFunctor&) 7 0x107566baf JSC::Interpreter::unwind(JSC::ExecState*&, JSC::JSValue&, unsigned int) 8 0x107587543 JSC::genericUnwind(JSC::VM*, JSC::ExecState*, JSC::JSValue, unsigned int) 9 0x10758768c JSC::jitThrowNew(JSC::VM*, JSC::ExecState*, JSC::JSValue) 10 0x1075a8347 cti_vm_handle_exception 11 0x10759e289 ctiVMHandleException 12 0x107584d67 JSC::JITCode::execute(JSC::JSStack*, JSC::ExecState*, JSC::VM*) 13 0x107565024 JSC::Interpreter::execute(JSC::EvalExecutable*, JSC::ExecState*, JSC::JSValue, JSC::JSScope*) 14 0x107564761 JSC::eval(JSC::ExecState*) 15 0x1075a7054 cti_op_call_eval 16 0x1075a92c0 jscGeneratedNativeCode 17 0x107584d67 JSC::JITCode::execute(JSC::JSStack*, JSC::ExecState*, JSC::VM*) 18 0x107567efb JSC::Interpreter::execute(JSC::ProgramExecutable*, JSC::ExecState*, JSC::JSObject*) 19 0x107341e7f JSC::evaluate(JSC::ExecState*, JSC::SourceCode const&, JSC::JSValue, JSC::JSValue*) 20 0x10a88c868 WebCore::WorkerScriptController::evaluate(WebCore::ScriptSourceCode const&, WebCore::ScriptValue*) 21 0x10a88c68c WebCore::WorkerScriptController::evaluate(WebCore::ScriptSourceCode const&) 22 0x10a8905d1 WebCore::WorkerThread::workerThread() 23 0x10a8902c5 WebCore::WorkerThread::workerThreadStart(void*) … This is because the WorkerThread is servicing a TerminationException which is trying to shut the worker thread down. During exception handling, we end up unwinding the stack twice in the CommonSlowPath code: once in LLInt::returnToThrow() and the second time in ctiVMHandleException(). This occurs because the LLINT expects the CommonSlowPath code to unwind the stack before returning while the JIT expects the CommonSlowPath code to only set the exception object and leave the stack as is when it returns. The fix is to make the LLINT unwind the stack if needed after the CommonSlowPath code returns just like the JIT, thereby making the CommonSlowPath code behave consistently for both the LLINT and the JIT. Ref: <rdar://problem/14972616> 935634 1 213221 mark.lam 2013-10-02 18:52:40 -0700 Created attachment 213221 the patch. 935637 2 213221 fpizlo 2013-10-02 19:15:32 -0700 Comment on attachment 213221 the patch. View in context: https://bugs.webkit.org/attachment.cgi?id=213221&action=review > Source/JavaScriptCore/llint/LLIntExceptions.cpp:47 > -static void doThrow(ExecState* exec) > +void handleException(ExecState* exec) Is this function called anywhere other than slow_path_handle_exception? > Source/JavaScriptCore/llint/LowLevelInterpreter32_64.asm:317 > + // mlam jmp _llint_throw_from_slow_path_trampoline > + What is this? 935639 3 213221 mark.lam 2013-10-02 19:18:23 -0700 Comment on attachment 213221 the patch. View in context: https://bugs.webkit.org/attachment.cgi?id=213221&action=review >> Source/JavaScriptCore/llint/LLIntExceptions.cpp:47 >> +void handleException(ExecState* exec) > > Is this function called anywhere other than slow_path_handle_exception? Nope. I'll merge the code over. >> Source/JavaScriptCore/llint/LowLevelInterpreter32_64.asm:317 >> + > > What is this? Darn! That was an experiment to check if my change caused some floating point result rounding errors in the 32-bit build. The result: rounding errors not due to my changes. But I accidentally left this experimental code in there. Will fix. 935640 4 213221 fpizlo 2013-10-02 19:19:10 -0700 Comment on attachment 213221 the patch. r=me if you make the changes you said in Comment #3. 935643 5 213224 mark.lam 2013-10-02 19:32:31 -0700 Created attachment 213224 Revised patch. Thanks for the review. Will land after running some tests on this new patch. 935644 6 mark.lam 2013-10-02 19:43:43 -0700 Landed in r156818: <http://trac.webkit.org/r156818>. 213221 2013-10-02 18:52:40 -0700 2013-10-02 19:32:31 -0700 the patch. bug-122255.patch text/plain 8429 mark.lam SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMTU2ODE1KQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDMzIEBA CisyMDEzLTEwLTAyICBNYXJrIExhbSAgPG1hcmsubGFtQGFwcGxlLmNvbT4KKworICAgICAgICBN YWtlIExMSU5UIGV4Y2VwdGlvbiBzdGFjayB1bndpbmRpbmcgY29uc2lzdGVudCB3aXRoIHRoZSBK SVQuCisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9pZD0xMjIy NTUuCisKKyAgICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BTISkuCisKKyAgICAgICAgUHJl dmlvdXNseSwgdGhlIENvbW1vblNsb3dQYXRocyBjb2RlIGlzIGV4cGVjdGVkIHRvIGJlaGF2ZSBp 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