[Webkit-unassigned] [Bug 121108] New: Web Inspector gets paused twice when there is an exception in host function

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=121108

           Summary: Web Inspector gets paused twice when there is an
                    exception in host function
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: joepeck at webkit.org
                CC: timothy at apple.com, mark.lam at apple.com


Created an attachment (id=211217)
 --> (https://bugs.webkit.org/attachment.cgi?id=211217&action=review)
[TEST] Manual Test Case

See attached test case. The Inspector gets paused twice, as a result of two JSC::Debugger::exception calls. Once as expected at the throw statement, then once again, unexpectedly at the Array.prototype.map call site.

* STEPS TO REPRODUCE
1. Inspect attached [TEST]
2. Open Debugger Navigation Sidebar
3. Enable Breakpoint on "All Exceptions"
4. Click <button> on the page => inspector will pause
5. Click Continue in Web Inspector's Debugger sidebar
  => unexpectedly pause again

* NOTES
(lldb) bt
* thread #1: tid = 0x96660e, 0x000000010f3bb3f7 WebCore`WebCore::ScriptDebugServer::exception(this=0x00007ffdabc43e80, debuggerCallFrame=0x00007fff547edb38, sourceID=1, lineNumber=27, columnNumber=0, hasHandler=true) + 39 at ScriptDebugServer.cpp:529, queue = 'com.apple.main-thread, stop reason = breakpoint 1.1
    frame #0: 0x000000010f3bb3f7 WebCore`WebCore::ScriptDebugServer::exception(this=0x00007ffdabc43e80, debuggerCallFrame=0x00007fff547edb38, sourceID=1, lineNumber=27, columnNumber=0, hasHandler=true) + 39 at ScriptDebugServer.cpp:529
    frame #1: 0x000000010cdec89d JavaScriptCore`JSC::Interpreter::unwind(this=0x00007ffdadb09ab0, callFrame=0x00007fff547edc10, exceptionValue=0x00007fff547edc08, bytecodeOffset=27) + 909 at Interpreter.cpp:668
    frame #2: 0x000000010ce0d4ae JavaScriptCore`JSC::genericUnwind(vm=0x00007ffdae005e00, callFrame=0x0000000115ea5190, exceptionValue=JSValue at 0x00007fff547edc08, vPCIndex=27) + 110 at JITExceptions.cpp:73
    frame #3: 0x000000010cf1ad18 JavaScriptCore`doThrow(exec=0x0000000115ea5190, pc=0x00007ffdb6eb0010) + 136 at LLIntExceptions.cpp:51
    frame #4: 0x000000010cf1ac7d JavaScriptCore`JSC::LLInt::returnToThrow(exec=0x0000000115ea5190, pc=0x00007ffdb6eb0010) + 29 at LLIntExceptions.cpp:60
    frame #5: 0x000000010cf21ddd JavaScriptCore`llint_slow_path_throw(exec=0x0000000115ea5190, pc=0x00007ffdb6eb0010) + 173 at LLIntSlowPaths.cpp:1222
    frame #6: 0x000000010cf29abb JavaScriptCore`llint_op_throw + 15

(lldb) bt
* thread #1: tid = 0x96660e, 0x000000010f3bb3f7 WebCore`WebCore::ScriptDebugServer::exception(this=0x00007ffdabc43e80, debuggerCallFrame=0x00007fff547ee018, sourceID=1, lineNumber=26, columnNumber=0, hasHandler=true) + 39 at ScriptDebugServer.cpp:529, queue = 'com.apple.main-thread, stop reason = breakpoint 1.1
    frame #0: 0x000000010f3bb3f7 WebCore`WebCore::ScriptDebugServer::exception(this=0x00007ffdabc43e80, debuggerCallFrame=0x00007fff547ee018, sourceID=1, lineNumber=26, columnNumber=0, hasHandler=true) + 39 at ScriptDebugServer.cpp:529
    frame #1: 0x000000010cdec89d JavaScriptCore`JSC::Interpreter::unwind(this=0x00007ffdadb09ab0, callFrame=0x00007fff547ee0f0, exceptionValue=0x00007fff547ee0e8, bytecodeOffset=46) + 909 at Interpreter.cpp:668
    frame #2: 0x000000010ce0d4ae JavaScriptCore`JSC::genericUnwind(vm=0x00007ffdae005e00, callFrame=0x0000000115ea50b8, exceptionValue=JSValue at 0x00007fff547ee0e8, vPCIndex=46) + 110 at JITExceptions.cpp:73
    frame #3: 0x000000010ce0d5ec JavaScriptCore`JSC::jitThrowNew(vm=0x00007ffdae005e00, callFrame=0x0000000115ea50b8, exceptionValue=JSValue at 0x00007fff547ee138) + 60 at JITExceptions.cpp:96
    frame #4: 0x000000010ce2d8e2 JavaScriptCore`cti_vm_handle_exception(callFrame=0x0000000115ea50b8) + 178 at JITStubs.cpp:2189
    frame #5: 0x000000010ce23d29 JavaScriptCore`ctiVMHandleException + 8

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