[Webkit-unassigned] [Bug 112926] New: Web Inspector: Page crash when using Script preprocessor

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=112926

           Summary: Web Inspector: Page crash when using Script
                    preprocessor
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Web Inspector
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: johnjbarton at chromium.org
                CC: keishi at webkit.org, pmuellr at yahoo.com,
                    pfeldman at chromium.org, yurys at chromium.org,
                    apavlov at chromium.org, loislo at chromium.org,
                    vsevik at chromium.org,
                    web-inspector-bugs at googlegroups.com


See also bug 111889  Bug 80992 and Bug 104384

When I apply the script preprocessor twice, the second time the page crashes (sad face page).

In a debug build I see:
...
injectedScript._commandLineAPIImpl = new CommandLineAPIImpl();
return injectedScript;
})

../../third_party/WebKit/Source/WebCore/bindings/v8/ScriptDebugServer.cpp(158) : WTF::String WebCore::ScriptDebugServer::ScriptPreprocessor::preprocessSourceCode(const WTF::String&, const WTF::String&, WebCore::DOMWindow*)
ERROR: Resulted in  0 bytes: 
../../third_party/WebKit/Source/WebCore/bindings/v8/ScriptDebugServer.cpp(159) : WTF::String WebCore::ScriptDebugServer::ScriptPreprocessor::preprocessSourceCode(const WTF::String&, const WTF::String&, WebCore::DOMWindow*)
ERROR: dispatchDidParseSource: 
../../third_party/WebKit/Source/WebCore/bindings/v8/ScriptDebugServer.cpp(557) : void WebCore::ScriptDebugServer::dispatchDidParseSource(WebCore::ScriptDebugListener*, v8::Handle<v8::Object>)
ASSERTION FAILED: v->IsFunction()
../../third_party/WebKit/Source/WebCore/bindings/v8/custom/V8InjectedScriptManager.cpp(103) : WebCore::ScriptObject WebCore::InjectedScriptManager::createInjectedScript(const WTF::String&, WebCore::ScriptState*, int)

The truncated output and the next two messages are my debugging output, indicating that just before the crash we preprocessed a script and the result has zero bytes then hit an assert in V8InjectedScriptManager.cpp

So I guess that the injected script from the reload is being preprocessed with the preprocessor from the previous reload, that preprocessor is failing to return a string, and the assert is hitting before the error from the failure of the preprocessor lands in the Inspector.

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