23078 2009-01-02 08:56:59 -0800 [jsfunfuzz] unwind logic for exceptions in eval fails to account for dynamic scope external to the eval 2009-01-02 20:37:00 -0800 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) Mac OS X 10.5 RESOLVED FIXED P1 Normal --- 13638 1 oliver oliver oldest_to_newest 104087 0 oliver 2009-01-02 08:56:59 -0800 Reduced case (function(){with({}) eval("try { unknown; } catch(x) { unknown; }")})() #0 0x004af39d in JSC::ScopeChainNode::globalObject (this=0x911f90) at JSGlobalObject.h:331 #1 0x004af3e3 in JSC::ExecState::lexicalGlobalObject (this=0xa100b0) at interpreter/CallFrame.h:53 #2 0x004b6160 in JSC::ExecState::dynamicGlobalObject (this=0xa100b0) at JSGlobalObject.h:350 #3 0x0050c2a8 in JSC::Interpreter::throwException (this=0x1009e00, callFrame=@0xbffff46c, exceptionValue=@0xbffff468, bytecodeOffset=13, explicitThrow=false) at /Volumes/Data/WebKit/OpenSource/JavaScriptCore/interpreter/Interpreter.cpp:826 #4 0x0050c5b4 in JSC::Interpreter::cti_vm_throw (args=0x0) at /Volumes/Data/WebKit/OpenSource/JavaScriptCore/interpreter/Interpreter.cpp:6056 #5 0x004ff8e2 in JSC::Interpreter::retrieveCaller () at /Volumes/Data/WebKit/OpenSource/JavaScriptCore/interpreter/Interpreter.cpp:4007 #6 0x00520158 in JSC::JIT::execute (code=0x481a0, registerFile=0x1009e34, callFrame=0xa10048, globalData=0x1009800, exception=0xbffff5c0) at JIT.h:350 #7 0x00507115 in JSC::Interpreter::execute (this=0x1009e00, programNode=0x911f20, callFrame=0x90d3e4, scopeChain=0x90d540, thisObj=0x50000, exception=0xbffff5c0) at /Volumes/Data/WebKit/OpenSource/JavaScriptCore/interpreter/Interpreter.cpp:910 #8 0x0048f7b4 in JSC::evaluate (exec=0x90d3e4, scopeChain=@0x90d3a0, source=@0xbffff64c, thisValue=0x0) at Completion.cpp:67 #9 0x00002a10 in runWithScripts (globalObject=0x50000, fileNames=@0xbffff6bc, dump=false) at /Volumes/Data/WebKit/OpenSource/JavaScriptCore/jsc.cpp:336 #10 0x00003a8b in jscmain (argc=2, argv=0xbffff744, globalData=0x1009800) at /Volumes/Data/WebKit/OpenSource/JavaScriptCore/jsc.cpp:459 #11 0x00003b2b in main (argc=2, argv=0xbffff744) at /Volumes/Data/WebKit/OpenSource/JavaScriptCore/jsc.cpp:300 104185 1 oliver 2009-01-02 15:57:17 -0800 Finally worked out the cause of this. in the expression eval("try { throw } catch(e){ /* handler */ }") The eval code will be compiled such that the handler will have an expected scope depth of 0. However if we place the eval inside a with() (or similar), with({}) eval("try { throw } catch(e){ /* handler */ }") We encounter a problem -- eval works in the local scope of the function the calls it -- eg. the base of the eval scope is the top of the scope chain at the point it is called. This means we get the following scope chain behaviour: [G] -- global object [G,activation] -- enter the function [G,activation, {}] -- enter with [G,activation, {}] -- call eval [G,activation, {}] -- throw. At this point we find the exception handler and it says the expected scope depth is *zero* [G,activation] -- unwound the stack [G] -- exit with, and whoops, we have just dropped the activation :-O 104212 2 26388 oliver 2009-01-02 20:27:17 -0800 Created attachment 26388 Fixerate the accursed thing Fixed 104213 3 oliver 2009-01-02 20:37:00 -0800 Committing to http://svn.webkit.org/repository/webkit/trunk ... M JavaScriptCore/ChangeLog M JavaScriptCore/bytecompiler/BytecodeGenerator.cpp M JavaScriptCore/bytecompiler/BytecodeGenerator.h M JavaScriptCore/interpreter/Interpreter.cpp M JavaScriptCore/runtime/ScopeChain.cpp M JavaScriptCore/runtime/ScopeChain.h M LayoutTests/ChangeLog A LayoutTests/fast/js/exception-with-handler-inside-eval-with-dynamic-scope-expected.txt A LayoutTests/fast/js/exception-with-handler-inside-eval-with-dynamic-scope.html A LayoutTests/fast/js/resources/exception-with-handler-inside-eval-with-dynamic-scope.js Committed r39571 26388 2009-01-02 20:27:17 -0800 2009-01-02 20:32:21 -0800 Fixerate the accursed thing bug23078.patch text/plain 7624 oliver ZGlmZiAtLWdpdCBhL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZyBiL0phdmFTY3JpcHRDb3JlL0No YW5nZUxvZwppbmRleCBmNDQ3MWU4Li5mOTcxNjdkIDEwMDY0NAotLS0gYS9KYXZhU2NyaXB0Q29y ZS9DaGFuZ2VMb2cKKysrIGIvSmF2YVNjcmlwdENvcmUvQ2hhbmdlTG9nCkBAIC0xLDUgKzEsMjkg QEAKIDIwMDktMDEtMDIgIE9saXZlciBIdW50ICA8b2xpdmVyQGFwcGxlLmNvbT4KIAorICAgICAg 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