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Building a java tracer
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Building a java tracer

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Building a java tracer Building a java tracer Presentation Transcript

  • Building a Java Tracer Rahul Revo
  • Sequence
      • Java Bytecode
      • JNI + JVMTI
      • ASM
      • Demo
      • What's Next
      • Questions
  • Java Bytecode
      • What's Bytecode
      • Class Format
      • Opcode + Argument(s) => Instruction
      • Stack based generic VM => Thread, stack, frames
      • Tools: hexdump, javap, Bytecode Outline
  • JNI + JVMTI
      • Java + C => JNI
      • javah, gcc => libFoo.so
      • JVM Tool Interface
      • -agentpath -javaagent
      • Events - ExceptionCatch, Thread start, Field Modification
      • Functions - Thread, Heap, Timer
  • ASM
      • Model for the Class File format
      • Bytecode analysis
      • Bytecode manipulation
  • JVMTI meets ASM
      • ClassFileLoadHook
      • Method In and Out trace
  • Demo
      • Trace "Hello, World"
  • What's Next
      • Better visualization
      • VS Historical debugger
      • Omniscient debugger
  • Questions