how to let asm compute frame automatically?

Hi all,

    I want to let asm compute frame for me.
    I use the tree API to instrument a file, the code is followed:

            ClassReader cr = new ClassReader(new FileInputStream(file));
            cn = new ClassNode();
            cr.accept(cn, 0);

   I know from the asm guide that the COMPUTE_FRAMES option of ClassWriter
   can let asm compute frame automatically. But how to accomplish it when I
use
   the tree API?

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