[cfe-dev] how to get the CFG information in a new analysis action?

[redder_0210]

Dear All,
I want to add a command option in Clang to analyze  the cfg information.
I have modified the Driver of Clang. Also, the CompilerInstance has been modified partly. 
In the directory "lib\frontendtool\ExecuteCompilerInvocation.cpp",  I add some codes as follows(with the color red):
static FrontendAction * CreateFrontendBaseAction(CompilerInstance &CI){
........
........
case RunANewAnalysis:   ////////this case is added by myself
         return new ento::NewAnalysisAction();
.......
.......
}
Now my question is that who(which class or object) deals with the new action.
Then how should I do to get the cfg information?
PS:
I also create the NewAnalysisAction with the return value *ASTConsumer.
But I have no idea that how to deal with the ASTConsumer, and how to translate to cfg then.  


Thanks.

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