~/talk

Bytecode Pattern Matching

on YouTube 39m
Talkat EclipseCon Europe 2018 · 2018-10-23..10-25· [java, compilers-and-language-design]

speaker

name:Evgeny Mandrikov
website:https://sonarsource.com/

resources

video:https://youtu.be/48kp3h10brM
slides:none on file

summary

Hands-on exploration of how javac, ECJ and kotlinc transform simple source into surprising bytecode, with JaCoCo/EclEmma used to measure and then filter out compiler-generated artifacts. Concrete examples: enums produce a synthetic values array and a generated constructor/accessor bridge methods; string switches become a two-stage hashcode-and-equals sequence that can turn 3 source branches into 9 bytecode branches; try/finally and try-with-resources duplicate calls; Java 11 nestmates remove some synthetic shims. Filters are implemented in JaCoCo and improve coverage reports.

AI-written summary · about

chapters (12)

  1. 0:00Start
  2. 0:57Java Code Coverage
  3. 4:02Disclaimer
  4. 5:39Constant Pool
  5. 6:06Default Constructor
  6. 10:07Java Virtual Machine Specification
  7. 12:05Constructor Invocation
  8. 13:11Accessible Constructor
  9. 14:24Accessor Methods
  10. 15:41Bridge Methods
  11. 33:34Default Arguments and Kotlin
  12. 37:49Conclusion

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