Re: adding nodes in a tree --(about function name mangling)

["sean yang" <seanatpurdue at hotmail dot com>]

> From: Daniel Berlin <dberlin@dberlin.org>
> To: sean yang <seanatpurdue@hotmail.com>
> CC: gcc@gcc.gnu.org
> Subject: Re: adding nodes in a tree --after GIMPLIFICATION, before SSA
> Date: Wed, 19 Apr 2006 22:38:11 -0700

> In fact, there are only *two* places a call can occur in GIMPLE at  that 
> point: bare, or the RHS of a MODIFY_EXPR.
>
> The following code will give you *all* the CALL_EXPR statements in a  
> function.
>
>
> block_stmt_iterator bsi;
> basic_block bb;
>
> FOR_EACH_BB (bb)
> {
>   for (bsi = bsi_start (bb); !bsi_end_p (bsi); bsi_next (&bsi))
>   {
>     tree stmt = bsi_stmt (bsi);
>     if (TREE_CODE (stmt) == CALL_EXPR
>        || (TREE_CODE (stmt) == MODIFY_EXPR && TREE_CODE  (TREE_OPERAND 
> (stmt, 1) == CALL_EXPR))
>      {
>        /* Do your thing, make sure to use BSI_SAME flags so that  
> iteration will move properly.  */
>      }
>   }
> }

How can we get the rule of name mangling in GCC frontend?
For example,  the sysbol name for foo in C is still "foo", but the sysmbol 
name for foo in C++ (output of g++) is something like "_Z3foov". Futhermore, 
symbol name foo in fortran is "_foo".


If I want to instrument mpi calls in a program, the three languages synopsis 
(c, c++, fortran) are different.
e.g. mpi_bsend has three interface:
C++:  void MPI::Comm::Bsend; C: MPI_Bsend; Fortran: MPI_BSEND

I want to insert the instrumentation code no matter from what language the 
MPI subroutines are called.
I think I can take care of C and Fortran by the following (psuedo) code, but 
how can i find the rule for c++ name mangling? are there many cases that I 
need take care of?

if (TREE_CODE ( t ) == FUNCTION_DECL){

 if (( !strncmp (IDENTIFIER_POINTER(DECL_NAME (t) , "mpi_", 4) || ( 
!strncmp (IDENTIFIER_POINTER(DECL_NAME (t) , "_mpi_", 5)) {
    //(1) handles case of C language; (2) handle the case of Fortran
}

}

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