gimplification---gimple tree for C and C++

[sean yang]

I have two (maybe dummy) question here:

1) For C programs, gimplification is done in gimplify_function_tree(), which 
is called (through several caller layers) from toplev_main().
Can someone explain how gimplification is done for C++?
Maybe another way to ask it is: I understand cc1 is generated from 
toplev_main(). But what is the "main entrance" for the compiler for C++ 
(cc1plus)?

2) If I want to have a procedure to walk the gimple tree for both C and C++ 
program, i.e., after the tree has been lowered to GIMPLE, where should I add 
it? I guess this question may be automatically explained after answering 
above question.

Thanks,
Sean

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