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How does spectre perform topology check?

Baiyuzhong

 When I have one transistor with floating Body , the spectre will gives following warning:

"Notice from spectre during topology check.
    Only one connection to node `I0.net9'.
Warning from spectre during heuristic topology check - set topcheck=fixall to fix all floating nodes.
    WARNING (SPECTRE-7): No DC path from node `I0.net9' to ground."

My question is:

(1) how does spectre perform topology check?

(2) what is the definition for "DC path" and how does spectre identify these DC path?

If anyone can provide some description/documents, it would be great. Thank you.

 

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