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Typical errors in code on the example of C++, C#, and Java

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Andrey Karpov

The document discusses typical coding errors in C++, C#, and Java, focusing on error patterns such as copy-pasting mistakes, logical errors in conditional statements, and array index out-of-bounds. It highlights the importance of using static analysis tools to detect these issues and provides examples of common mistakes made by developers. Additionally, the document promotes educational resources offered by the Information Technology Video Developer Network to help programmers improve their skills and avoid such errors.

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Typical errors in code on the example of C++, C#, and Java Information Technology Video Developer Network Информационный видеосервис для разработчиков программного обеспечения http://itvdn.com
Георгий Грибков About the speaker Information Technology Video Developer Network http://itvdn.com ITVDN C++ developer of the PVS-Studio static code analyzer • Develops the analyzer core, new diagnostics, supports users. • Introduced PVS-Studio in the godbolt.org online compiler. • Wrote articles for the Habr website and gave talks at IT conferences, related to searching for bugs in code. Typical errors in code on the example of C++, C#, and Java
Agenda Information Technology Video Developer Network http://itvdn.com ITVDN 1. Objectives of this webinar 2. How we detected error patterns 3. Patterns themselves and how to avoid them: 3.1 Copy-paste and last line effect 3.2 if (A) {...} else if (A) 3.3 Errors in checks 3.4 Array index out of bounds 3.5 Operator precedence 3.6 Typos that are hard to spot 4. How to use static analysis properly 5. Conclusion 6. Q&A Заключение Typical errors in code on the example of C++, C#, and Java
Information Technology Video Developer Network http://itvdn.com ITVDN More than 50 video courses for C# developers at ITVDN C# Basics Author: Alexander Shevchuk Duration: 16 h 3 mins 9 lessons C# Basic (OOP) Author: Alexander Shevchuk Duration: 31 h 26 mins 18 lessons C# for professionals Author: Oleg Kulygin Duration: 19 h 38 mins 17 lessons C# Generics Author: Nikolay Melnichuk Duration: 4 h 49 mins 7 lessons Unit testing in C# Author: Dmitry Okhrimenko Duration: 3 h 48 mins 3 lessons .NET Apps Refactoring Author: David Boyarov Duration: 6 h 41 mins, 5 lessons
Information Technology Video Developer Network http://itvdn.com ITVDN More than 26 video courses for Java developers at ITVDN Java Starter Author: Evgeny Tikhonov Duration: 9 h 46 mins 9 lessons Java Essential Author: Evgeny Tikhonov Duration: 11 h 10 mins 10 lessons Java Professional Author : Evgeny Tikhonov Duration: 20 h 18 mins 15 lessons SOLID principles in Java Author: Andrey Fok Duration: 2 h 45 mins 5 lessons Unit testing in Java with JUnit Author: Mikhail Skafenko Duration: 2 h 33 mins 7 lessons Java EE Basics Author: Andrey Bondarenko Duration: 18 h 50 mins 12 lessons
Information Technology Video Developer Network http://itvdn.com ITVDN Video courses for C++ developers at ITVDN C++ Starter Author: Vladimir Vinogradov Duration: 8 h 13 mins 13 lessons QT Framework Author: Ruslan Larionenko Duration: 6 h 27 mins 10 lessons C++ Essential Author: Kirill Chernega Duration: 4 h 38 mins 8 lessons C++Advanced Author: Kirill Chernega Duration: 8 h 17 mins 11 lessons Complete practical tasks in C++ Author: Naumenko Alexander Duration: 4 h 39 mins, 7 lessons STL - Standard Template Library Author: Pavlenko Alexander Duration: 7 h 5 mins, 12 lessons
Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Information Technology Video Developer Network http://itvdn.com ITVDN * Typical errors in code on the example of C++, C#, and Java
Information Technology Video Developer Network http://itvdn.com ITVDN BUGS ARE EVERYWHERE! Typical errors in code on the example of C++, C#, and Java
How to avoid errors Information Technology Video Developer Network http://itvdn.com ITVDN • Warn developers of typical problems • Use tools to automatically search for errors Typical errors in code on the example of C++, C#, and Java
Objectives of this webinar Information Technology Video Developer Network http://itvdn.com ITVDN • Demonstrate typical error patterns in code • Show how to use static analysis properly Typical errors in code on the example of C++, C#, and Java
2. How we detected error patterns Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
What is static analysis Information Technology Video Developer Network http://itvdn.com ITVDN Static analysis is automated code review. Typical errors in code on the example of C++, C#, and Java
What is static analysis Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Examples of static analyzers Information Technology Video Developer Network http://itvdn.com ITVDN • PVS-Studio • Cppcheck • Infer • IntelliJ IDEA • Clang Static Analyzer • FindBugs • ... Long list of static analyzers: Typical errors in code on the example of C++, C#, and Java
How we detected error patterns Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java Found errors 380 13747 Checked projects Detected errors
Check out the base of errors we found: Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
3. Patterns themselves and how to avoid them Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Pattern № 1: Copy-paste and last line effect Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Elasticsearch (Java) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Elasticsearch (Java) Information Technology Video Developer Network http://itvdn.com ITVDN PVS-Studio warning: V6039 There are two 'if' statements with identical conditional expressions. The first 'if' statement contains method return. This means that the second 'if' statement is senseless. Typical errors in code on the example of C++, C#, and Java
Information Technology Video Developer Network http://itvdn.com ITVDN Clang (C++) Typical errors in code on the example of C++, C#, and Java
Information Technology Video Developer Network http://itvdn.com ITVDN Clang (C++) PVS-Studio warning: V501 There are identical sub-expressions SM.getExpansionColumnNumber(ContainerREnd)' to the left and to the right of the '>=' operator. Typical errors in code on the example of C++, C#, and Java
Information Technology Video Developer Network http://itvdn.com ITVDN Clang (C++) PVS-Studio warning: V501 There are identical sub-expressions SM.getExpansionColumnNumber(ContainerREnd)' to the left and to the right of the '>=' operator. Typical errors in code on the example of C++, C#, and Java
Xenko Game Engine (C#) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Xenko Game Engine (C#) Information Technology Video Developer Network http://itvdn.com ITVDN PVS-Studio warning: V3001 There are identical sub-expressions 'box.Maximum.X - box.Minimum.X > sphere.Radius' to the left and to the right of the '&&' operator. Typical errors in code on the example of C++, C#, and Java
Pattern № 1: Copy-paste and last line effect Information Technology Video Developer Network http://itvdn.com ITVDN • We selected 84 examples of erroneous code written with copy-paste • 43 of them had an error in the last line! • It is more than 50%! Typical errors in code on the example of C++, C#, and Java
Information Technology Video Developer Network http://itvdn.com ITVDN • Stop copy-pasting • Copy-pasting in programming is pure evil! • If you dare to – be extremely attentive How to avoid Typical errors in code on the example of C++, C#, and Java
Pattern № 2. if (A) {...} else if (A) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Elasticsearch (Java) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Elasticsearch (Java) Information Technology Video Developer Network http://itvdn.com ITVDN PVS-Studio warning: V6003 The use of 'if (A) {....} else if (A) {....}' pattern was detected. There is a probability of logical error presence. Typical errors in code on the example of C++, C#, and Java
Chromium (C++) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Chromium (C++) Information Technology Video Developer Network http://itvdn.com ITVDN PVS-Studio warning: V517 The use of 'if (A) {...} else if (A) {...}' pattern was detected. There is a probability of logical error presence. Check lines: 61, 63. Typical errors in code on the example of C++, C#, and Java
CryEngine V (C++) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
CryEngine V (C++) Information Technology Video Developer Network http://itvdn.com ITVDN PVS-Studio warning: V517 The use of 'if (A) {...} else if (A) {...}' pattern was detected. There is a probability of logical error presence. Check lines: 266, 268. Typical errors in code on the example of C++, C#, and Java
CryEngine V (C++) Information Technology Video Developer Network http://itvdn.com ITVDN PVS-Studio warning: V517 The use of 'if (A) {...} else if (A) {...}' pattern was detected. There is a probability of logical error presence. Check lines: 266, 268. Typical errors in code on the example of C++, C#, and Java
MonoDevelop (C#) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
MonoDevelop (C#) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
MonoDevelop (C#) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
MonoDevelop (C#) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
MonoDevelop (C#) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
MonoDevelop (C#) Information Technology Video Developer Network http://itvdn.com ITVDN PVS-Studio warning: V3021 There are two 'if' statements with identical conditional expressions. The first 'if' statement contains method return. This means that the second 'if' statement is senseless. Typical errors in code on the example of C++, C#, and Java
Information Technology Video Developer Network http://itvdn.com ITVDN • Try to do best not to copy-paste • If you’re still going to copy-paste, copy non-compiled constructions. • Example: if (value == _) return _; How to avoid? Typical errors in code on the example of C++, C#, and Java
Pattern № 3. Errors in checks Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Unity (C#) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Unity (C#) Information Technology Video Developer Network http://itvdn.com ITVDN PVS-Studio warning: V3063 A part of conditional expression is always true if it is evaluated: pageSize <= 1000. Typical errors in code on the example of C++, C#, and Java
Bullet - the engine of Red Dead Redemption (C++) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Bullet - the engine of Red Dead Redemption (C++) Information Technology Video Developer Network http://itvdn.com ITVDN PVS-Studio warning: V709 Suspicious comparison found: 'f0 == f1 == m_fractureBodies.size()’. Remember that 'a == b == c’ is not equal to 'a == b && b == c'. Typical errors in code on the example of C++, C#, and Java
Apache Hive (Java) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Apache Hive (Java) Information Technology Video Developer Network http://itvdn.com ITVDN PVS-Studio warning: V6030 The method located to the right of the '|' operator will be called regardless of the value of the left operand. Perhaps, it is better to use '||'. Typical errors in code on the example of C++, C#, and Java
Chromium (C++) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Chromium (C++) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Chromium (C++) Information Technology Video Developer Network http://itvdn.com ITVDN PVS-Studio warnings:  V547 Expression 'time.month <= kDaysInMonth[time.month] + 1' is always true.  V547 Expression 'time.month <= kDaysInMonth[time.month]’ is always true. Typical errors in code on the example of C++, C#, and Java
Information Technology Video Developer Network http://itvdn.com ITVDN • «Pay attention!» won’t work every time  • Try backup tools How to avoid Typical errors in code on the example of C++, C#, and Java
Pattern № 4. Array index out of bounds Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Stickies (C++) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Stickies (C++) Information Technology Video Developer Network http://itvdn.com ITVDN PVS-Studio warning: V557 Array overrun is possible. The '64' index is pointing beyond array bound. stickies stickies.cpp Typical errors in code on the example of C++, C#, and Java
Elasticsearch (Java) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Elasticsearch (Java) Information Technology Video Developer Network http://itvdn.com ITVDN PVS-Studio warning: V6025 Possibly index '(int) x' is out of bounds. Typical errors in code on the example of C++, C#, and Java
Elasticsearch (Java) Information Technology Video Developer Network http://itvdn.com ITVDN PVS-Studio warning: V6025 Possibly index '(int) x' is out of bounds. Typical errors in code on the example of C++, C#, and Java
IPP Samples (C++) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
IPP Samples (C++) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
IPP Samples (C++) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
IPP Samples (C++) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
IPP Samples (C++) Information Technology Video Developer Network http://itvdn.com ITVDN PVS-Studio warning: V557 Array overrun is possible. The '30' index is pointing beyond array bound. Typical errors in code on the example of C++, C#, and Java
FastReport (C#) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
FastReport (C#) Information Technology Video Developer Network http://itvdn.com ITVDN PVS-Studio warning: V3106 Possible negative index value. The value of 'idx' index could reach -1. Typical errors in code on the example of C++, C#, and Java
Information Technology Video Developer Network http://itvdn.com ITVDN • Be careful when you add '0’ to the end of the string • Do you get an external index? Make sure you check it! • Don’t mix up '>' ('<‘) and '>=' ('<=‘) when comparing the index with the array size How to avoid Typical errors in code on the example of C++, C#, and Java
4. How to use static analysis properly Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
When you should perform static analysis Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
When you should perform static analysis Information Technology Video Developer Network http://itvdn.com ITVDN Static analysis Typical errors in code on the example of C++, C#, and Java
How to make the most of static analysis Information Technology Video Developer Network http://itvdn.com ITVDN • Apply static analysis at early stages • Analyze regularly Typical errors in code on the example of C++, C#, and Java
Proprietary development Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Proprietary development Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Proprietary development Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Proprietary development Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Proprietary development Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Corporate development Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Corporate development Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Corporate development Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Corporate development Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Corporate development Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Corporate development Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Corporate development Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Open-source development Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Open-source development Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Open-source development Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Open-source development Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
More about analysis of commits and pull-requests Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
5. Conclusion Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
Typical error patterns in code Information Technology Video Developer Network http://itvdn.com ITVDN • Copy-paste and last line effect • if (A) {...} else if (A) • Errors in checks • Array index out of bounds • … (the list gradually expands) Typical errors in code on the example of C++, C#, and Java
How to avoid typical errors Information Technology Video Developer Network http://itvdn.com ITVDN • Stop copy-pasting! • Seriously, stop copy-pasting! • Pay attention to checks, even small and short ones. • Carefully check array indexes. • Regularly use static analysis. Typical errors in code on the example of C++, C#, and Java
Free PVS-Studio license for students Information Technology Video Developer Network http://itvdn.com ITVDN https://bit.ly/pvs-student Typical errors in code on the example of C++, C#, and Java
Information Technology Video Developer Network http://itvdn.com ITVDN Q&A Typical errors in code on the example of C++, C#, and Java
Information Technology Video Developer Network http://itvdn.com ITVDN Watch our video lessons on C++ At ITVDN you’ll find a collection of video courses and webinars for C++ developers. Go to ITVDN.com and watch our video lessons right now!
IT VIDEO DEVELOPERS NETWORK Information Technology Video Developer Network http://itvdn.com ITVDN

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Typical errors in code on the example of C++, C#, and Java

  • 1. Typical errors in code on the example of C++, C#, and Java Information Technology Video Developer Network Информационный видеосервис для разработчиков программного обеспечения http://itvdn.com
  • 2. Георгий Грибков About the speaker Information Technology Video Developer Network http://itvdn.com ITVDN C++ developer of the PVS-Studio static code analyzer • Develops the analyzer core, new diagnostics, supports users. • Introduced PVS-Studio in the godbolt.org online compiler. • Wrote articles for the Habr website and gave talks at IT conferences, related to searching for bugs in code. Typical errors in code on the example of C++, C#, and Java
  • 3. Agenda Information Technology Video Developer Network http://itvdn.com ITVDN 1. Objectives of this webinar 2. How we detected error patterns 3. Patterns themselves and how to avoid them: 3.1 Copy-paste and last line effect 3.2 if (A) {...} else if (A) 3.3 Errors in checks 3.4 Array index out of bounds 3.5 Operator precedence 3.6 Typos that are hard to spot 4. How to use static analysis properly 5. Conclusion 6. Q&A Заключение Typical errors in code on the example of C++, C#, and Java
  • 4. Information Technology Video Developer Network http://itvdn.com ITVDN More than 50 video courses for C# developers at ITVDN C# Basics Author: Alexander Shevchuk Duration: 16 h 3 mins 9 lessons C# Basic (OOP) Author: Alexander Shevchuk Duration: 31 h 26 mins 18 lessons C# for professionals Author: Oleg Kulygin Duration: 19 h 38 mins 17 lessons C# Generics Author: Nikolay Melnichuk Duration: 4 h 49 mins 7 lessons Unit testing in C# Author: Dmitry Okhrimenko Duration: 3 h 48 mins 3 lessons .NET Apps Refactoring Author: David Boyarov Duration: 6 h 41 mins, 5 lessons
  • 5. Information Technology Video Developer Network http://itvdn.com ITVDN More than 26 video courses for Java developers at ITVDN Java Starter Author: Evgeny Tikhonov Duration: 9 h 46 mins 9 lessons Java Essential Author: Evgeny Tikhonov Duration: 11 h 10 mins 10 lessons Java Professional Author : Evgeny Tikhonov Duration: 20 h 18 mins 15 lessons SOLID principles in Java Author: Andrey Fok Duration: 2 h 45 mins 5 lessons Unit testing in Java with JUnit Author: Mikhail Skafenko Duration: 2 h 33 mins 7 lessons Java EE Basics Author: Andrey Bondarenko Duration: 18 h 50 mins 12 lessons
  • 6. Information Technology Video Developer Network http://itvdn.com ITVDN Video courses for C++ developers at ITVDN C++ Starter Author: Vladimir Vinogradov Duration: 8 h 13 mins 13 lessons QT Framework Author: Ruslan Larionenko Duration: 6 h 27 mins 10 lessons C++ Essential Author: Kirill Chernega Duration: 4 h 38 mins 8 lessons C++Advanced Author: Kirill Chernega Duration: 8 h 17 mins 11 lessons Complete practical tasks in C++ Author: Naumenko Alexander Duration: 4 h 39 mins, 7 lessons STL - Standard Template Library Author: Pavlenko Alexander Duration: 7 h 5 mins, 12 lessons
  • 7. Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 8. Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 9. Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 10. Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 11. Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 12. Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 13. Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 14. Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 15. Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 16. Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 17. Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 18. Information Technology Video Developer Network http://itvdn.com ITVDN * Typical errors in code on the example of C++, C#, and Java
  • 19. Information Technology Video Developer Network http://itvdn.com ITVDN BUGS ARE EVERYWHERE! Typical errors in code on the example of C++, C#, and Java
  • 20. How to avoid errors Information Technology Video Developer Network http://itvdn.com ITVDN • Warn developers of typical problems • Use tools to automatically search for errors Typical errors in code on the example of C++, C#, and Java
  • 21. Objectives of this webinar Information Technology Video Developer Network http://itvdn.com ITVDN • Demonstrate typical error patterns in code • Show how to use static analysis properly Typical errors in code on the example of C++, C#, and Java
  • 22. 2. How we detected error patterns Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 23. What is static analysis Information Technology Video Developer Network http://itvdn.com ITVDN Static analysis is automated code review. Typical errors in code on the example of C++, C#, and Java
  • 24. What is static analysis Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 25. Examples of static analyzers Information Technology Video Developer Network http://itvdn.com ITVDN • PVS-Studio • Cppcheck • Infer • IntelliJ IDEA • Clang Static Analyzer • FindBugs • ... Long list of static analyzers: Typical errors in code on the example of C++, C#, and Java
  • 26. How we detected error patterns Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java Found errors 380 13747 Checked projects Detected errors
  • 27. Check out the base of errors we found: Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 28. 3. Patterns themselves and how to avoid them Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 29. Pattern № 1: Copy-paste and last line effect Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 30. Elasticsearch (Java) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 31. Elasticsearch (Java) Information Technology Video Developer Network http://itvdn.com ITVDN PVS-Studio warning: V6039 There are two 'if' statements with identical conditional expressions. The first 'if' statement contains method return. This means that the second 'if' statement is senseless. Typical errors in code on the example of C++, C#, and Java
  • 32. Information Technology Video Developer Network http://itvdn.com ITVDN Clang (C++) Typical errors in code on the example of C++, C#, and Java
  • 33. Information Technology Video Developer Network http://itvdn.com ITVDN Clang (C++) PVS-Studio warning: V501 There are identical sub-expressions SM.getExpansionColumnNumber(ContainerREnd)' to the left and to the right of the '>=' operator. Typical errors in code on the example of C++, C#, and Java
  • 34. Information Technology Video Developer Network http://itvdn.com ITVDN Clang (C++) PVS-Studio warning: V501 There are identical sub-expressions SM.getExpansionColumnNumber(ContainerREnd)' to the left and to the right of the '>=' operator. Typical errors in code on the example of C++, C#, and Java
  • 35. Xenko Game Engine (C#) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 36. Xenko Game Engine (C#) Information Technology Video Developer Network http://itvdn.com ITVDN PVS-Studio warning: V3001 There are identical sub-expressions 'box.Maximum.X - box.Minimum.X > sphere.Radius' to the left and to the right of the '&&' operator. Typical errors in code on the example of C++, C#, and Java
  • 37. Pattern № 1: Copy-paste and last line effect Information Technology Video Developer Network http://itvdn.com ITVDN • We selected 84 examples of erroneous code written with copy-paste • 43 of them had an error in the last line! • It is more than 50%! Typical errors in code on the example of C++, C#, and Java
  • 38. Information Technology Video Developer Network http://itvdn.com ITVDN • Stop copy-pasting • Copy-pasting in programming is pure evil! • If you dare to – be extremely attentive How to avoid Typical errors in code on the example of C++, C#, and Java
  • 39. Pattern № 2. if (A) {...} else if (A) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 40. Elasticsearch (Java) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 41. Elasticsearch (Java) Information Technology Video Developer Network http://itvdn.com ITVDN PVS-Studio warning: V6003 The use of 'if (A) {....} else if (A) {....}' pattern was detected. There is a probability of logical error presence. Typical errors in code on the example of C++, C#, and Java
  • 42. Chromium (C++) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 43. Chromium (C++) Information Technology Video Developer Network http://itvdn.com ITVDN PVS-Studio warning: V517 The use of 'if (A) {...} else if (A) {...}' pattern was detected. There is a probability of logical error presence. Check lines: 61, 63. Typical errors in code on the example of C++, C#, and Java
  • 44. CryEngine V (C++) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 45. CryEngine V (C++) Information Technology Video Developer Network http://itvdn.com ITVDN PVS-Studio warning: V517 The use of 'if (A) {...} else if (A) {...}' pattern was detected. There is a probability of logical error presence. Check lines: 266, 268. Typical errors in code on the example of C++, C#, and Java
  • 46. CryEngine V (C++) Information Technology Video Developer Network http://itvdn.com ITVDN PVS-Studio warning: V517 The use of 'if (A) {...} else if (A) {...}' pattern was detected. There is a probability of logical error presence. Check lines: 266, 268. Typical errors in code on the example of C++, C#, and Java
  • 47. MonoDevelop (C#) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 48. MonoDevelop (C#) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 49. MonoDevelop (C#) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 50. MonoDevelop (C#) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 51. MonoDevelop (C#) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 52. MonoDevelop (C#) Information Technology Video Developer Network http://itvdn.com ITVDN PVS-Studio warning: V3021 There are two 'if' statements with identical conditional expressions. The first 'if' statement contains method return. This means that the second 'if' statement is senseless. Typical errors in code on the example of C++, C#, and Java
  • 53. Information Technology Video Developer Network http://itvdn.com ITVDN • Try to do best not to copy-paste • If you’re still going to copy-paste, copy non-compiled constructions. • Example: if (value == _) return _; How to avoid? Typical errors in code on the example of C++, C#, and Java
  • 54. Pattern № 3. Errors in checks Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 55. Unity (C#) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 56. Unity (C#) Information Technology Video Developer Network http://itvdn.com ITVDN PVS-Studio warning: V3063 A part of conditional expression is always true if it is evaluated: pageSize <= 1000. Typical errors in code on the example of C++, C#, and Java
  • 57. Bullet - the engine of Red Dead Redemption (C++) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 58. Bullet - the engine of Red Dead Redemption (C++) Information Technology Video Developer Network http://itvdn.com ITVDN PVS-Studio warning: V709 Suspicious comparison found: 'f0 == f1 == m_fractureBodies.size()’. Remember that 'a == b == c’ is not equal to 'a == b && b == c'. Typical errors in code on the example of C++, C#, and Java
  • 59. Apache Hive (Java) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 60. Apache Hive (Java) Information Technology Video Developer Network http://itvdn.com ITVDN PVS-Studio warning: V6030 The method located to the right of the '|' operator will be called regardless of the value of the left operand. Perhaps, it is better to use '||'. Typical errors in code on the example of C++, C#, and Java
  • 61. Chromium (C++) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 62. Chromium (C++) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 63. Chromium (C++) Information Technology Video Developer Network http://itvdn.com ITVDN PVS-Studio warnings:  V547 Expression 'time.month <= kDaysInMonth[time.month] + 1' is always true.  V547 Expression 'time.month <= kDaysInMonth[time.month]’ is always true. Typical errors in code on the example of C++, C#, and Java
  • 64. Information Technology Video Developer Network http://itvdn.com ITVDN • «Pay attention!» won’t work every time  • Try backup tools How to avoid Typical errors in code on the example of C++, C#, and Java
  • 65. Pattern № 4. Array index out of bounds Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 66. Stickies (C++) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 67. Stickies (C++) Information Technology Video Developer Network http://itvdn.com ITVDN PVS-Studio warning: V557 Array overrun is possible. The '64' index is pointing beyond array bound. stickies stickies.cpp Typical errors in code on the example of C++, C#, and Java
  • 68. Elasticsearch (Java) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 69. Elasticsearch (Java) Information Technology Video Developer Network http://itvdn.com ITVDN PVS-Studio warning: V6025 Possibly index '(int) x' is out of bounds. Typical errors in code on the example of C++, C#, and Java
  • 70. Elasticsearch (Java) Information Technology Video Developer Network http://itvdn.com ITVDN PVS-Studio warning: V6025 Possibly index '(int) x' is out of bounds. Typical errors in code on the example of C++, C#, and Java
  • 71. IPP Samples (C++) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 72. IPP Samples (C++) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 73. IPP Samples (C++) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 74. IPP Samples (C++) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 75. IPP Samples (C++) Information Technology Video Developer Network http://itvdn.com ITVDN PVS-Studio warning: V557 Array overrun is possible. The '30' index is pointing beyond array bound. Typical errors in code on the example of C++, C#, and Java
  • 76. FastReport (C#) Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 77. FastReport (C#) Information Technology Video Developer Network http://itvdn.com ITVDN PVS-Studio warning: V3106 Possible negative index value. The value of 'idx' index could reach -1. Typical errors in code on the example of C++, C#, and Java
  • 78. Information Technology Video Developer Network http://itvdn.com ITVDN • Be careful when you add '0’ to the end of the string • Do you get an external index? Make sure you check it! • Don’t mix up '>' ('<‘) and '>=' ('<=‘) when comparing the index with the array size How to avoid Typical errors in code on the example of C++, C#, and Java
  • 79. 4. How to use static analysis properly Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 80. When you should perform static analysis Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 81. When you should perform static analysis Information Technology Video Developer Network http://itvdn.com ITVDN Static analysis Typical errors in code on the example of C++, C#, and Java
  • 82. How to make the most of static analysis Information Technology Video Developer Network http://itvdn.com ITVDN • Apply static analysis at early stages • Analyze regularly Typical errors in code on the example of C++, C#, and Java
  • 83. Proprietary development Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 84. Proprietary development Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 85. Proprietary development Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 86. Proprietary development Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 87. Proprietary development Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 88. Corporate development Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 89. Corporate development Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 90. Corporate development Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 91. Corporate development Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 92. Corporate development Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 93. Corporate development Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 94. Corporate development Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 95. Open-source development Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 96. Open-source development Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 97. Open-source development Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 98. Open-source development Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 99. More about analysis of commits and pull-requests Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 100. 5. Conclusion Information Technology Video Developer Network http://itvdn.com ITVDN Typical errors in code on the example of C++, C#, and Java
  • 101. Typical error patterns in code Information Technology Video Developer Network http://itvdn.com ITVDN • Copy-paste and last line effect • if (A) {...} else if (A) • Errors in checks • Array index out of bounds • … (the list gradually expands) Typical errors in code on the example of C++, C#, and Java
  • 102. How to avoid typical errors Information Technology Video Developer Network http://itvdn.com ITVDN • Stop copy-pasting! • Seriously, stop copy-pasting! • Pay attention to checks, even small and short ones. • Carefully check array indexes. • Regularly use static analysis. Typical errors in code on the example of C++, C#, and Java
  • 103. Free PVS-Studio license for students Information Technology Video Developer Network http://itvdn.com ITVDN https://bit.ly/pvs-student Typical errors in code on the example of C++, C#, and Java
  • 104. Information Technology Video Developer Network http://itvdn.com ITVDN Q&A Typical errors in code on the example of C++, C#, and Java
  • 105. Information Technology Video Developer Network http://itvdn.com ITVDN Watch our video lessons on C++ At ITVDN you’ll find a collection of video courses and webinars for C++ developers. Go to ITVDN.com and watch our video lessons right now!
  • 106. IT VIDEO DEVELOPERS NETWORK Information Technology Video Developer Network http://itvdn.com ITVDN