JVM bytecode engineering 101

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This document provides an overview of Java bytecode engineering and the Java Virtual Machine (JVM) architecture. It discusses the JVM instruction set and bytecode format. It also covers bytecode manipulation tools like ASM and how to decompile, modify, and recompile bytecode. The document is intended as an introduction to working with bytecode directly.

Technology Education

JVM bytecode engineering 101

Kees Jan Koster
kjkoster@java-monitor.com
Wednesday, November 6, 13

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http://java-monitor.com/livedemo.html

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java-monitor
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workflow and toolchain
JVM architecture
instruction set basics

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write in
java
compile
to .class
decompile

tweak
bootstrap
recompile
to .class
debug

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CA FE BA BE 00 04 AD 00 DA 00 .. .. ..

verifier

class loader

class

JVM

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CA FE BA BE 00 04 AD 00 DA 00 .. .. ..
0xCAFEBABE

version #

constant pool
e.g. strings

access flags
class info
fields
methods
attributes
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CA FE BA BE 00 04 AD 00 DA 00 .. .. ..
0xCAFEBABE

version #

constant pool

Transformer

e.g. strings

access flags
class info
fields
methods
attributes
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static final Logger __log = new ...

__log.info(…);

__log.info(…);

CA FE BA BE 00 04 AD 00 DA 00 .. .. ..

Transformer
CA FE BA BE 00 04 AD 00 BE 45 76 .. .. ..

verifier

class loader

class

JVM

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AspectJ

Spring

http://www.slideshare.net/tcurdt/no-dark-magic-byte-code-engineering-in-the-real-world
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operand stack
local variables
• this pointer
stack frames and invoking methods
constant pool
atomic vs object types
exceptions

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write in
java
javap
ASMifier
bytecode plugin

compile
to .class
decompile

tweak
bootstrap
recompile
to .class
debug

Wednesday, November 6, 13

write in
java
compile
to .class
decompile

tweak
bootstrap
recompile
to .class

ASM CheckClassAdapter
debug

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nobody forced you

Wednesday, November 6, 13

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JVM bytecode engineering 101

1. JVM bytecode engineering 101 Kees Jan Koster kjkoster@java-monitor.com Wednesday, November 6, 13

2. Wednesday, November 6, 13

3. • http://java-monitor.com/livedemo.html • • • • free, on-line service up and running in 5 minutes access server stats from your mobile get help in the integrated forum Wednesday, November 6, 13

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6. Wednesday, November 6, 13

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8. Wednesday, November 6, 13

9. • • • workflow and toolchain JVM architecture instruction set basics Wednesday, November 6, 13

10. write in java compile to .class decompile tweak bootstrap recompile to .class debug Wednesday, November 6, 13

11. CA FE BA BE 00 04 AD 00 DA 00 .. .. .. verifier class loader class JVM Wednesday, November 6, 13

12. CA FE BA BE 00 04 AD 00 DA 00 .. .. .. 0xCAFEBABE version # constant pool e.g. strings access flags class info fields methods attributes Wednesday, November 6, 13

13. CA FE BA BE 00 04 AD 00 DA 00 .. .. .. 0xCAFEBABE version # constant pool Transformer e.g. strings access flags class info fields methods attributes Wednesday, November 6, 13 static final Logger __log = new ... __log.info(…); __log.info(…);

14. CA FE BA BE 00 04 AD 00 DA 00 .. .. .. Transformer CA FE BA BE 00 04 AD 00 BE 45 76 .. .. .. verifier class loader class JVM Wednesday, November 6, 13

15. AspectJ Spring http://www.slideshare.net/tcurdt/no-dark-magic-byte-code-engineering-in-the-real-world Wednesday, November 6, 13

16. • • • • • • operand stack local variables • this pointer stack frames and invoking methods constant pool atomic vs object types exceptions Wednesday, November 6, 13

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22. write in java javap ASMifier bytecode plugin compile to .class decompile tweak bootstrap recompile to .class debug Wednesday, November 6, 13

23. write in java compile to .class decompile tweak bootstrap recompile to .class ASM CheckClassAdapter debug Wednesday, November 6, 13

24. nobody forced you Wednesday, November 6, 13