[RTL] -- How to insert code into functions?

[王 逸]

Hi, everyone!
I'd like to patch GCC to insert some RTL code into all compiled functions.
 
For example, I'd like the following instructions to be inserted 
automatically by GCC:
int main()
{
//instructions1 generated by my patch.
......
function body;
......
//instructions2 generated by my patch.
}
 
Where should I insert RTL codes?
 
In gcc/toplev.c, there is a function rest_of_compilation(), may be I should 
modify this function?
But I'm not familiar with this function and this function is so~~~~ long, 
would someone give me some advice?
thanks.
 
 
Wang Yi
Graduate student @ NJU P.R.C.

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