Code Instrumentation

[Wolfgang]

Hallo,

i would like to instrument some existing code. For example, after an ADD-EXPR:

int main() {
  int a=5;
  int b=5;
  int c = a + b; ...
}

should become:
...
 int c = a + b;
 puts("ADD-EXPR");
...

I thought writing a Gimple-pass would be best, but i don't know exactly where to start. I'm able to walk throug the Gimple-Statements and debug it, but i'm not able to insert something.
Is there any source-code available?

Thanks
Wolfgang
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