[Webkit-unassigned] [Bug 119184] New: Debug assert when emitting debug hooks for video game

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=119184

           Summary: Debug assert when emitting debug hooks for video game
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
               URL: http://www.nihilogic.dk/labs/tetris/
        OS/Version: Mac OS X 10.8
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: burg at cs.washington.edu
                CC: timothy at apple.com


Repro steps:

1. In a debug build, open the Web Inspector from Safari (which will cause debug hooks to be emitted).
2. Load the page http://www.nihilogic.dk/labs/tetris/
3. Profit

This seems to have regressed in the past month or so, but I don't have a tight bisect range for you. It wasn't a problem in git 24c0bd0a70e282daac4f0fe07b7e084ecc9d7b64, but is a problem in nightlies (git 937da75e2962c8f765b7da637fd7632349cc7906).

---

ASSERTION FAILED: line >= firstLine
/Users/burg/repos/timelapse/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.h(282) : void JSC::BytecodeGenerator::emitExpressionInfo(int, int, int, unsigned int, int)
1   0x10513ef40 WTFCrash
2   0x104c5ca2c JSC::BytecodeGenerator::emitExpressionInfo(int, int, int, unsigned int, int)
3   0x104c556a1 JSC::BytecodeGenerator::emitDebugHook(JSC::DebugHookID, unsigned int, unsigned int, unsigned int, unsigned int)
4   0x10500c97a JSC::ProgramNode::emitBytecode(JSC::BytecodeGenerator&, JSC::RegisterID*)
5   0x104c4b5b4 JSC::BytecodeGenerator::generate()
6   0x104ccf424 JSC::UnlinkedProgramCodeBlock* JSC::CodeCache::getCodeBlock<JSC::UnlinkedProgramCodeBlock, JSC::ProgramExecutable>(JSC::VM&, JSC::ProgramExecutable*, JSC::SourceCode const&, JSC::JSParserStrictness, JSC::DebuggerMode, JSC::ProfilerMode, JSC::ParserError&)
7   0x104cce6ae JSC::CodeCache::getProgramCodeBlock(JSC::VM&, JSC::ProgramExecutable*, JSC::SourceCode const&, JSC::JSParserStrictness, JSC::DebuggerMode, JSC::ProfilerMode, JSC::ParserError&)
8   0x104f65f8f JSC::JSGlobalObject::createProgramCodeBlock(JSC::ExecState*, JSC::ProgramExecutable*, JSC::JSObject**)
9   0x104eb1d7d JSC::ProgramExecutable::initializeGlobalProperties(JSC::VM&, JSC::ExecState*, JSC::JSScope*)
10  0x104ee0e55 JSC::Interpreter::execute(JSC::ProgramExecutable*, JSC::ExecState*, JSC::JSObject*)
11  0x104ce8201 JSC::evaluate(JSC::ExecState*, JSC::SourceCode const&, JSC::JSValue, JSC::JSValue*)
12  0x106c50262 WebCore::JSMainThreadExecState::evaluate(JSC::ExecState*, JSC::SourceCode const&, JSC::JSValue, JSC::JSValue*)
13  0x1074c12ec WebCore::ScriptController::evaluateInWorld(WebCore::ScriptSourceCode const&, WebCore::DOMWrapperWorld*)
14  0x1074c1434 WebCore::ScriptController::evaluate(WebCore::ScriptSourceCode const&)
15  0x1074d7de8 WebCore::ScriptElement::executeScript(WebCore::ScriptSourceCode const&)
16  0x10678220d WebCore::HTMLScriptRunner::executePendingScriptAndDispatchEvent(WebCore::PendingScript&)
17  0x10678201c WebCore::HTMLScriptRunner::executeParsingBlockingScript()
18  0x106782841 WebCore::HTMLScriptRunner::executeParsingBlockingScripts()
19  0x10678248c WebCore::HTMLScriptRunner::execute(WTF::PassRefPtr<WebCore::Element>, WTF::TextPosition const&)
20  0x1066eb9fa WebCore::HTMLDocumentParser::runScriptsForPausedTreeBuilder()
21  0x1066ebb38 WebCore::HTMLDocumentParser::canTakeNextToken(WebCore::HTMLDocumentParser::SynchronousMode, WebCore::PumpSession&)
22  0x1066eb24d WebCore::HTMLDocumentParser::pumpTokenizer(WebCore::HTMLDocumentParser::SynchronousMode)
23  0x1066ead99 WebCore::HTMLDocumentParser::pumpTokenizerIfPossible(WebCore::HTMLDocumentParser::SynchronousMode)
24  0x1066ec320 WebCore::HTMLDocumentParser::append(WTF::PassRefPtr<WTF::StringImpl>)
25  0x10627944c WebCore::DecodedDataDocumentParser::appendBytes(WebCore::DocumentWriter*, char const*, unsigned long)
26  0x106378c9e WebCore::DocumentWriter::addData(char const*, unsigned long)
27  0x10634997b WebCore::DocumentLoader::commitData(char const*, unsigned long)
28  0x1037f9b90 WebKit::WebFrameLoaderClient::committedLoad(WebCore::DocumentLoader*, char const*, int)
29  0x10634b6a0 WebCore::DocumentLoader::commitLoad(char const*, int)
30  0x10634bc96 WebCore::DocumentLoader::dataReceived(WebCore::CachedResource*, char const*, int)
31  0x105ff3714 WebCore::CachedRawResource::didAddClient(WebCore::CachedResourceClient*)
ERROR: Failed to send message to real exception port. (ipc/send) invalid destination port (10000003)
/Users/burg/repos/timelapse/Source/WebKit2/Platform/CoreIPC/mac/ConnectionMac.cpp(487) : void CoreIPC::Connection::exceptionSourceEventHandler()
SHOULD NEVER BE REACHED
/Users/burg/repos/timelapse/Source/WebKit2/Platform/CoreIPC/mac/ConnectionMac.cpp(488) : void CoreIPC::Connection::exceptionSourceEventHandler()
1   0x10acd4f40 WTFCrash
2   0x10c15c3bc CoreIPC::Connection::exceptionSourceEventHandler()
3   0x10c151f22 WTF::FunctionWrapper<void (CoreIPC::Connection::*)()>::operator()(CoreIPC::Connection*)
4   0x10c151ea5 WTF::BoundFunctionImpl<WTF::FunctionWrapper<void (CoreIPC::Connection::*)()>, void (CoreIPC::Connection*)>::operator()()
5   0x10c15d4b5 ___ZNK3WTF8FunctionIFvvEEcvU13block_pointerS1_Ev_block_invoke
6   0x7fff8dbf10b6 _dispatch_client_callout
7   0x7fff8dbf329b _dispatch_source_invoke
8   0x7fff8dbf2305 _dispatch_queue_invoke
9   0x7fff8dbf2448 _dispatch_queue_drain
10  0x7fff8dbf22f1 _dispatch_queue_invoke
11  0x7fff8dbf21c3 _dispatch_worker_thread2
12  0x7fff8e0c8d0b _pthread_wqthread
13  0x7fff8e0b31d1 start_wqthread

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