Proguard: The open source optimizer for Java bytecode

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The open source optimizer for Java bytecode @soulesidibe Proguard

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• Proguard, quèsaco? • Proguard on Android • Why should we use Proguard? Agenda

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Proguard, quèsaco?

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Proguard • By Guard Square • First release 2002 • Written in… java • For Java based app(Java *E, Android, etc)

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Proguard • Last version !-> 6.0 • ./gradlew buildEnvironment | grep proguard • Source code is on sourceforge.

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Proguard. Quèsaco? Input Jars Output Jars Shrink Optimize Obfuscate Preverify

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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

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Proguard. Quèsaco? Input Jars Output Jars Shrink Optimize Obfuscate Preverify

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Proguard. Quèsaco? Input Jars Output Jars Shrink Optimize Obfuscate Preverify proguard.optimize.Optimizer.java

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Proguard. Quèsaco? Input Jars Output Jars Shrink Optimize Obfuscate Preverify • Renames classes and members that are not entry points

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Proguard. Quèsaco? Input Jars Output Jars Shrink Optimize Obfuscate Preverify • I don’t know ☹ • Generate mapping files

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Proguard on Android

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Proguard on Android build.gradle

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Proguard on Android • dump.txt • mapping.txt • seeds.txt • usage.txt

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Proguard errors

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Proguard errors -dontwarn com.google.errorprone.annotations.* -dontwarn org.codehaus.mojo.animal_sniffer.*

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Proguard errors • ClassNotFoundException • MethodNotFoundException

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Proguard errors • ClassNotFoundException • MethodNotFoundException

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Proguard on Android Démo

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Why should we use Proguard?

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Why should we use Proguard? • More compact code

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Why should we use Proguard? • More compact code • The obfuscation

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Why should we use Proguard? • More compact code • The obfuscation • Smaller app

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Why should we use Proguard? • More compact code • The obfuscation • Smaller app • Avoid 64k methods limit

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That’s it! @soulesidibe