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  1. Qt
  2. QTBUG-37317

QScriptEngine::evaluate ASSERT crash and possible memory leak.

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      Description

      Crash happens in debug mode if QScriptEngine::evaluate(program(script)) is called. But works fine if calling with the same script other evaluate function QScriptEngine::evaluate(script).

      Crash happens in ASSERT located here:

      .\src\3rdparty\javascriptcore\JavaScriptCore\runtime\Executable.cpp
      JSObject* EvalExecutable::compile(ExecState* exec, ScopeChainNode* scopeChainNode)
      {
      ...
          ASSERT(!m_evalCodeBlock);
      ...
      }
      

      Looks like Executable instance is re-used when running program and m_evalCodeBlock not cleaned causing crash. So in release mode new m_evalCodeBlock is just allocated and possibly leaks memory. When running plain script Executable is re-created.

      Easy to reproduce with the attached example in debug mode.

      1. Enter a number > 0 in the first spin box.
      2. Hit Calc
      3. -> program counts up
      => no crash

      Do the same with checkbox "Use Program" enabled => ASSERT at first recursion.

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            Assignee:
            laknoll Lars Knoll
            Reporter:
            qtcomsupport Qt Support
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              Resolved:

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