Re: Treatment of builtin that receives function pointer

Re: Treatment of builtin that receives function pointer

[Andrew Haley]

On 01/28/2010 02:44 PM, Paulo J. Matos wrote:
> On Wed, Jan 27, 2010 at 12:25 PM, Paulo J. Matos <pocmatos@gmail.com> wrote:
>> Now, I wonder in this more general case, where can I obtain the
>> function decl (so I can get its assembler name) for the function the
>> pointer is pointing to?
>>
> 
> Allow me to revive this question by asking if I can obtain the
> function assembler name given a direct function pointer to the
> function.
> 
> For example:
> void foo1(void) {...}
> 
> __get_name(foo1) ==> "foo1"
> 
> int foo2(int *x) { ... }
> 
> __get_name(foo2) ==> "foo2"
> 
> This is all I need. Any tips?

dladdr()

Andrew.

Re: Treatment of builtin that receives function pointer

[Paulo J. Matos]

On Thu, Jan 28, 2010 at 2:58 PM, Andrew Haley <aph@redhat.com> wrote:
>
> dladdr()
>

Thanks Andrew but this answer seems to assume I am trying to obtain
this in a C program from a previously compiled function.

However, I am inside GCC which access to the gimple tree of the function.

I found out the problem I was having but not the solution yet.
My builtin function gets angry when given a function pointer which is
not (void) (*)(void). As a result, it casts the function.
So something like:
void foo(int) { }
..
__mybuiltin(foo);

becomes internally:
void foo(int) { }
..
(void) (foo.0) (void) = ((void) (*)(void) foo);
__mybuiltin(foo.0);

This is why I am not being able to get my function name from the tree
of the builtin function call. I guess I need to parse the tree of the
current function to find the value of foo.0.

I am however open to suggestions.

> Andrew.
>



-- 
Paulo Jorge Matos - pocmatos at gmail.com
http://www.pmatos.net