Re: How to insert functions?

[Hugh Leather <hughleat at hotmail dot com>]

Hi Andrew,
>     Yes, I did a bit.  it segfaults at
>         cgraphunit.c:cgraph_expand_all_functions:1323
>         node->lowered = DECL_STRUCT_FUNCTION (node->decl)->cfg != NULL;
>     It seems that the node->decl has been nulled by the time it gets 
> here.  It definitely isn't NULL after leaving my code. 
>     Can you think of anything that might do that?  I figured I must be 
> doing something pretty wrong and that there must be tons of examples 
> for this kind of thing but I haven't been able to find one.
>    
>
>     Cheers for the help,
>
>     Hugh.
>
> Andrew Haley wrote:
> > Hugh Leather wrote:
> >   
> > > Hi,
> > >
> > >   I am trying to add a new destructor function to object files I
> > > compile.  I'm doing this to instrument programs and then, once the
> > > program has finished I want to print out the statistics I've gathered.
> > >   So, just before pass 'remove_useless_stmts' is called on each function
> > > I try to create a static destructor which will print stats for the
> > > current function (and obviously, I don't do it on the functions just
> > > created).
> > >
> > >   Below I've put a simpler form, which should work for a one function
> > > program.  Calling createFnDecl() creates a new function called
> > > __my_new_function.  It should print "It worked!" when the program exits.
> > >   Now, with compiler flag -O0, this works just fine, but with -O1 or
> > > above it seg faults the compiler.
> > >
> > >   Can anyone tell me what I'm doing wrong?
> > >     
> >
> > Nothing obvious to me.  Did you debug the point at which the
> > segfault happened?
> >
> > Andrew.
> >
> >
> >