about parse tree

["LIU Fang" <liufang at sjtu dot edu dot cn>]

Hello, dear madam or sir.
 There is a project runing in our university, the first stage of which needs to analysis the parse tree generated by gcc. Thus, I search the web for documents that may bring benefit to us, but unfortunately the documents I can get all deals with the MACRO and functions providered by gcc to access the information contained by the parse tree. 
  I would ask whether there is description about the parse tree itself. If you have any answers, please infor me. 
	Thanks.
   

      Best regards.
													Liu Fang.

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