是否可以查看JVM热点编译器生成的机器代码？

Question

我想知道，是否可以了解HotSpot编译器在编译给定的Java字节码类或方法时生成的实际机器代码？

Answer 1

Yes, with -XX:+UnlockDiagnosticVMOptions -XX:+PrintAssembly the Hotspot VM can give you that information when it actually executes (compiles) a given bytecode method.

See for example HotSpotInternals Wiki:Print Assembly for details. It does require a disassembler module (hsdis-*.dll on Windows).

A bit more comfortable is using JITWatch (but it uses the same infrastructure from HotSpot).