Modifying GCC's emitted assembly code

[Amittai Aviram]

I have been creating a modified version of GCC's libgomp library to support a special version of OpenMP.  In order for it to work properly, at the end of the main function in an OpenMP program, I have to insert a call to a special clean-up function (say, "clean_up()"), just before the "return" statement.  (I define my clean_up function in my version of libgomp.)  I would like to modify GCC so that it inserts the call to clean_u automatically, just before the code representing the return statement, such as the RET instruction in x86 assembly code.  How might I go about this?

Alternatively, it might work if GCC inserted the function call into the boilerplate code of __exit.  How might I enable GCC to do that?

Thanks a lot!

Amittai Aviram
PhD Student in Computer Science
Yale University
646 483 2639
amittai.aviram@yale.edu
http://www.amittai.com