About Martin Thompson
Sometimes when profiling a Java application it is necessary to understand the assembly code generated by the Hotspot JIT compiler. This can be useful in determining what optimisation decisions have been made and how our code changes can affect the generated assembly code. It is also useful at times knowing what instructions are emitted when debugging a concurrent algorithm to ensure visibility rules have been applied as expected. I have found quite a few bugs in various JVMs this way.
This blog illustrates how to install a Disassembler Plugin and provides command line options for targeting a particular method.
Installation
Previously it was necessary to obtain a debug build for printing the assembly code generated by the Hotspot JIT for the Oracle/SUN JVM. Since Java 7, it has been possible to print the generated assembly code if a Disassembler Plugin is installed in a standard Oracle Hotspot JVM. To install the plugin for 64-bit Linux follow the steps below:
Source : http://www.javacodegeeks.com/2013/07/printing-generated-assembly-code-from-the-hotspot-jit-compiler.html
