93607 2012-08-09 05:21:39 -0700 Web Inspector: [JSC] Caught exception is treated as uncaught 2013-09-10 14:00:08 -0700 1 1 1 Unclassified WebKit Web Inspector (Deprecated) 528+ (Nightly build) All All RESOLVED FIXED InRadar P1 Critical --- 0 clarkli webkit-unassigned fpizlo ggaren graouts joepeck mark.lam oliver paul+bugs timothy oldest_to_newest 691410 0 clarkli 2012-08-09 05:21:39 -0700 Webkit Version: r125153 With the flag "All Uncaught Exception" ON, show Error Console. Load the attached file. Actual: It paused in the "throw" line. Expected: Since the "throw" is within a try...catch, it should not be treated as an uncaught exception. This case is ok.=========================== try { throw new Error("x"); } catch (e) { } This case is bad: =========================== try { function f() { throw new Error("x"); } f(); } catch (e) { } 695744 1 desamo 2012-08-14 22:31:53 -0700 rdar://problem/12101592 897475 2 timothy 2013-06-05 10:59:23 -0700 *** Bug 117215 has been marked as a duplicate of this bug. *** 926978 3 joepeck 2013-09-09 16:06:15 -0700 Yep, this looks like a JSC issue. ScriptDebugServer::execution is getting called with "hasHandler" being false. We would expect this to be true, because there is an eventual exception handler up the stack. I suspect this is a regression that happened a while ago. --- (lldb) b ScriptDebugServer::exception (lldb) c * thread #1: tid = 0x8da30a, 0x00000001124613f7 WebCore`WebCore::ScriptDebugServer::exception(this=0x00007f948310b130, debuggerCallFrame=0x00007fff51742118, sourceID=1, lineNumber=14, columnNumber=0, hasHandler=false) + 39 at ScriptDebugServer.cpp:529, queue = 'com.apple.main-thread, stop reason = breakpoint 2.1 frame #0: 0x00000001124613f7 WebCore`WebCore::ScriptDebugServer::exception(this=0x00007f948310b130, debuggerCallFrame=0x00007fff51742118, sourceID=1, lineNumber=14, columnNumber=0, hasHandler=false) + 39 at ScriptDebugServer.cpp:529 526 527 void ScriptDebugServer::exception(const DebuggerCallFrame& debuggerCallFrame, intptr_t sourceID, int lineNumber, int columnNumber, bool hasHandler) 528 { -> 529 if (m_paused) 530 return; 531 532 if (m_pauseOnExceptionsState == PauseOnAllExceptions || (m_pauseOnExceptionsState == PauseOnUncaughtExceptions && !hasHandler)) (lldb) p hasHandler (bool) $8 = false (lldb) bt * thread #1: tid = 0x8da30a, 0x00000001124613f7 WebCore`WebCore::ScriptDebugServer::exception(this=0x00007f948310b130, debuggerCallFrame=0x00007fff51742118, sourceID=1, lineNumber=14, columnNumber=0, hasHandler=false) + 39 at ScriptDebugServer.cpp:529, queue = 'com.apple.main-thread, stop reason = breakpoint 2.1 frame #0: 0x00000001124613f7 WebCore`WebCore::ScriptDebugServer::exception(this=0x00007f948310b130, debuggerCallFrame=0x00007fff51742118, sourceID=1, lineNumber=14, columnNumber=0, hasHandler=false) + 39 at ScriptDebugServer.cpp:529 frame #1: 0x000000010fe92b3f JavaScriptCore`JSC::Interpreter::unwind(this=0x00007f9483464d50, callFrame=0x00007fff517421f0, exceptionValue=0x00007fff517421e8, bytecodeOffset=29) + 847 at Interpreter.cpp:633 frame #2: 0x000000010feb359e JavaScriptCore`JSC::genericUnwind(vm=0x00007f9482821400, callFrame=0x0000000118f600c8, exceptionValue=JSValue at 0x00007fff517421e8, vPCIndex=29) + 110 at JITExceptions.cpp:73 frame #3: 0x000000010ffc0e08 JavaScriptCore`doThrow(exec=0x0000000118f600c8, pc=0x00007f948303a970) + 136 at LLIntExceptions.cpp:51 frame #4: 0x000000010ffc0d6d JavaScriptCore`JSC::LLInt::returnToThrow(exec=0x0000000118f600c8, pc=0x00007f948303a970) + 29 at LLIntExceptions.cpp:60 frame #5: 0x000000010ffc89c5 JavaScriptCore`llint_slow_path_get_from_scope(exec=0x0000000118f600c8, pc=0x00007f948303a970) + 469 at LLIntSlowPaths.cpp:1295 frame #6: 0x000000010ffce851 JavaScriptCore`llint_op_get_from_scope + 494 926981 4 211111 joepeck 2013-09-09 16:09:29 -0700 Created attachment 211111 [TEST] Test Case Here is a manual test case. 927044 5 211132 joepeck 2013-09-09 19:10:07 -0700 Created attachment 211132 [PATCH] Proposed Fix Check the entire call stack for exception handlers, instead of just the local call frame. Added tests that cover this and other Inspector pause on exception states. 927068 6 211132 mark.lam 2013-09-09 20:09:52 -0700 Comment on attachment 211132 [PATCH] Proposed Fix The Interpreter.cpp changes LGTM. 927103 7 211132 ggaren 2013-09-09 21:23:53 -0700 Comment on attachment 211132 [PATCH] Proposed Fix View in context: https://bugs.webkit.org/attachment.cgi?id=211132&action=review Thanks, Joe! r=me, but please fix the logic error below, and add a test for it. > Source/JavaScriptCore/interpreter/Interpreter.cpp:582 > + if (!codeBlock) > + return StackVisitor::Done; I think you want StackVisitor::Continue here. Consider this stack: js function with try/catch scope => Array.prototype.map => js function => throw CodeBlock is null for host functions. Therefore, when you see Array.prototype.map, you'll return StackVisitor::Done and conclude that there's no handler. But there is a handler, in the function that called map. 927106 8 paul+bugs 2013-09-09 21:26:19 -0700 *** Bug 121010 has been marked as a duplicate of this bug. *** 927183 9 joepeck 2013-09-10 00:09:44 -0700 (In reply to comment #7) > (From update of attachment 211132 [details]) > View in context: https://bugs.webkit.org/attachment.cgi?id=211132&action=review > > Thanks, Joe! > > r=me, but please fix the logic error below, and add a test for it. > > > Source/JavaScriptCore/interpreter/Interpreter.cpp:582 > > + if (!codeBlock) > > + return StackVisitor::Done; > > I think you want StackVisitor::Continue here. > > Consider this stack: > js function with try/catch scope => Array.prototype.map => js function => throw > CodeBlock is null for host functions. Therefore, when you see Array.prototype.map, you'll return StackVisitor::Done and conclude that there's no handler. But there is a handler, in the function that called map. Good catch and thanks for the example! That indeed fixes a issue. It also uncovered a somewhat surprising double pause. Given: function exceptionInHostFunction() { [1].map(function(x) { throw "exception in host function"; }); } Setting the inspector to break on all exceptions, and evaluating: setTimeout(exceptionHostFunction, 0); The inspector pauses twice: 1. At the throw line. Continuing in Web Inspector goes to (2) 2. At the [].map line. Continuing in Web Inspector no longer pauses. I'll take a brief look at this. It exists separate from this issue/patch, but affects the tests I'm writing for this patch. 927402 10 joepeck 2013-09-10 11:57:54 -0700 (In reply to comment #9) > I'll take a brief look at this. It exists separate from this issue/patch, but affects the tests I'm writing for this patch. Filed: <https://webkit.org/b/121108> Web Inspector gets paused twice when there is an exception in host function I added a workaround in these tests to expect an extra pause. 927475 11 joepeck 2013-09-10 14:00:08 -0700 Committed <http://trac.webkit.org/changeset/155471>. 211111 2013-09-09 16:09:29 -0700 2013-09-09 16:09:29 -0700 [TEST] Test Case exception.html text/html 659 joepeck PHA+T3BlbiB0aGUgSW5zcGVjdG9yLCBFbmFibGUganVzdCB0aGUgIkFsbCBVbmNhdWdodCBFeGNl cHRpb25zIiBicmVha3BvaW50IGFuZCBjbGljayB0aGUgYnV0dG9ucyBiZWxvdy4gTmVpdGhlciBz aG91bGQgdHJpZ2dlciB0aGUgZGVidWdnZXIuPC9wPgoKPGJ1dHRvbiBpZD0ieDEiPkNhdWdodCBF eGNlcHRpb24gQmFzaWMgKHdvcmtzKTwvYnV0dG9uPjxicj4KPGJ1dHRvbiBpZD0ieDIiPkNhdWdo dCBFeGNlcHRpb24gT3RoZXIgKGZhaWxzKTwvYnV0dG9uPgoKPHNjcmlwdD4KZG9jdW1lbnQuZ2V0 RWxlbWVudEJ5SWQoIngxIikuYWRkRXZlbnRMaXN0ZW5lcigiY2xpY2siLCBmdW5jdGlvbihldmVu dCkgewogICAgdHJ5IHsKICAgICAgICBhLmIuYy5kCiAgICB9IGNhdGNoIChlKSB7CiAgICAgICAg Y29uc29sZS5sb2coImNhdWdodCBleGNlcHRpb24iLCBlKTsKICAgIH0KfSk7CgpmdW5jdGlvbiBm 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