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Utilities for ASM, a very small and fast Java bytecode manipulation framework

There is a newer version: 9.7.1






Provides a framework for static code analysis based on the asm.tree package.



Basic usage:


ClassReader cr = new ClassReader(bytecode);
ClassNode cn = new ClassNode();
cr.accept(cn, ClassReader.SKIP_DEBUG);

List methods = cn.methods;
for (int i = 0; i < methods.size(); ++i) {
    MethodNode method = (MethodNode) methods.get(i);
    if (method.instructions.size() > 0) {
        Analyzer a = new Analyzer(new BasicInterpreter());
        a.analyze(cn.name, method);
        Frame[] frames = a.getFrames();
        // Elements of the frames arrray now contains info for each instruction
        // from the analyzed method. BasicInterpreter creates BasicValue, that
        // is using simplified type system that distinguishes the UNINITIALZED,
        // INT, FLOAT, LONG, DOUBLE, REFERENCE and RETURNADDRESS types.
        ...
    }
}



@since ASM 1.4.3