// add assert startup code
 private void initAssertions(MethodVisitor mv) {
   mv.visitLdcInsn(Type.getType("L" + myClassName + ";"));
   mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Class", "desiredAssertionStatus", "()Z", false);
   Label l0 = new Label();
   mv.visitJumpInsn(IFNE, l0);
   mv.visitInsn(ICONST_1);
   Label l1 = new Label();
   mv.visitJumpInsn(GOTO, l1);
   mv.visitLabel(l0);
   mv.visitInsn(ICONST_0);
   mv.visitLabel(l1);
   mv.visitFieldInsn(PUTSTATIC, myClassName, ASSERTIONS_DISABLED_NAME, "Z");
 }