Proguard: The open source optimizer for Java bytecode

In this talk, I explain the mechanism of proguard. How it works internally. And I talk about the benefit of using it on your android application

Transcript

1. The open source optimizer for Java bytecode @soulesidibe Proguard
2. • Proguard, quèsaco? • Proguard on Android • Why should we use Proguard? Agenda
3. Proguard, quèsaco?
4. Proguard • By Guard Square • First release 2002 • Written in… java • For Java based app(Java *E, Android, etc)
5. Proguard • Last version !-> 6.0 • ./gradlew buildEnvironment | grep proguard • Source code is on sourceforge.
6. Proguard. Quèsaco? Input Jars Output Jars Shrink Optimize Obfuscate Preverify
7. Proguard. Quèsaco? Input Jars Output Jars Shrink Optimize Obfuscate Preverify • Looks at all possible entry points • Calculates the map of reachable code • Remove dead code
8. Proguard. Quèsaco? Input Jars Output Jars Shrink Optimize Obfuscate Preverify
9. Proguard. Quèsaco? Input Jars Output Jars Shrink Optimize Obfuscate Preverify proguard.optimize.Optimizer.java
10. Proguard. Quèsaco? Input Jars Output Jars Shrink Optimize Obfuscate Preverify • Renames classes and members that are not entry points
11. Proguard. Quèsaco? Input Jars Output Jars Shrink Optimize Obfuscate Preverify • I don’t know ☹ • Generate mapping files
12. Proguard on Android
13. Proguard on Android build.gradle
14. Proguard on Android • dump.txt • mapping.txt • seeds.txt • usage.txt
15. Proguard errors
16. Proguard errors -dontwarn com.google.errorprone.annotations.* -dontwarn org.codehaus.mojo.animal_sniffer.*
17. Proguard errors • ClassNotFoundException • MethodNotFoundException
18. Proguard errors • ClassNotFoundException • MethodNotFoundException
19. Proguard on Android Démo
20. Why should we use Proguard?
21. Why should we use Proguard? • More compact code
22. Why should we use Proguard? • More compact code • The obfuscation
23. Why should we use Proguard? • More compact code • The obfuscation • Smaller app
24. Why should we use Proguard? • More compact code • The obfuscation • Smaller app • Avoid 64k methods limit
25. That’s it! @soulesidibe