How to See JIT-Compiled Code in JVM
Despite just-in-time (JIT) compilation being a crucial aspect of optimizing Java Virtual Machine (JVM) performance, directly viewing its output code can be challenging. However, there are specific JVM options that allow for examining the native code generated by the JIT.
General Usage
The following JVM options can be added to command lines:
- -XX: UnlockDiagnosticVMOptions
- -XX: PrintAssembly
These options provide verbose output and include generated assembly instructions.
Filtering on a Specific Method
To limit the output to a particular method, use the syntax:
- -XX: UnlockDiagnosticVMOptions -XX:CompileCommand=print,*MyClass.myMethod
Installing Required Libraries on Windows
For Windows systems, installing hsdis-amd64.dll and hsdis-i386.dll is necessary to access the PrintAssembly functionality. Prebuilt binaries are available from the fcml project, or they can be built manually using Cygwin and binutils.
Building hsdis-amd64.dll and hsdis-i386.dll on Windows
-
Install Cygwin and select the following packages:
- make
- mingw64-x86_64-gcc-core (for hsdis-amd64.dll)
- mingw64-i686-gcc-core (for hsdis-i386.dll)
- diffutils
- Run the Cygwin Terminal and create a Cygwin home directory.
- Download and extract the GNU binutils and hsdis source packages to the Cygwin home directory.
- In the Cygwin Terminal, navigate to the hsdis directory and build hsdis-amd64.dll or hsdis-i386.dll using the appropriate commands.
- Modify the buildLinux-amd64bfdMakefile to change SUBDIRS = doc po to SUBDIRS = po.
- Re-run the build command.
- Copy the built DLLs to the JRE's bin directories.
Bonus Tip
To display assembly instructions using Intel rather than AT&T syntax, add -XX:PrintAssemblyOptions=intel to the JVM options.
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