bytecodelib is a JVM bytecode manipulation library with an LLVM-inspired API, built on top of the ASM library. I built it because working with SSA form is much easier than managing the operand stack and locals manually.
It has many deficiencies, both obvious (exception handlers are not
modeled) and subtle (invokespecial is not modeled, except for calling
superclass constructors). But for what it does do, it's easier to use
than ASM.
ant fetch; ant jar