public void visitIincInsn(final int var, final int increment) {
        // adds the instruction to the bytecode of the method
//        if ((var > 255) || (increment > 127) || (increment < -128)) {
//            code.putByte(196 /* WIDE */).put12(Opcodes.IINC, var).putShort(increment);
//        } else {
            code.putByte(132 /* Opcodes.IINC*/ ).put11(var, increment);
//        }
    }
Maximum number of local variables for this method.
src/main/java/com/alibaba/fastjson/asm/MethodWriter.java