dtrace discuss - Sep 2009 - tracing c++ methods using full signature

I would like to trace this method nsComponentManagerImpl::GetService 
(nsID const&, nsID const&, void**).

I cannot use nsComponentManagerImpl??GetService* because there are 3  
overloaded versions and I want the one above.

I understand that :: needs to be replaced with ?? but what about the  
other C++ special characters like & and *?

Can this be done or should I use mangled names instead?

	Thanks, Joel

---
fastest mac firefox!
http://wagerlabs.com

On Sat, Sep 12, 2009 at 12:04:31AM +0100, Joel Reymont
wrote:
> I would like to trace this method nsComponentManagerImpl::GetService 
> (nsID const&, nsID const&, void**).
> 
> I cannot use nsComponentManagerImpl??GetService* because there are 3  
> overloaded versions and I want the one above.
> 
> I understand that :: needs to be replaced with ?? but what about the  
> other C++ special characters like & and *?
> 
> Can this be done or should I use mangled names instead?
Probably the easiest thing would be to do:

dtrace -l -n ''whatever''

where ''whatever'' is the full probe spec for
nsComponentManagerImpl??GetService*.

Then, pick out the one which looks correct.

Cheers,
- jonathan

On Sep 12, 2009, at 12:28 AM, Jonathan Adams wrote:
> dtrace -l -n ''whatever''
>
> where ''whatever'' is the full probe spec for
nsComponentManagerImpl??
> GetService*.
>
> Then, pick out the one which looks correct.
I did this and I see

25833   pid39573               XUL non-virtual thunk to  
nsComponentManagerImpl::GetService(nsID const&, nsID const&,  
nsISupports**, nsIShutdownListener*) entry
25834   pid39573               XUL nsComponentManagerImpl::GetService 
(nsID const&, nsID const&, nsISupports**, nsIShutdownListener*) entry
25835   pid39573               XUL non-virtual thunk to  
nsComponentManagerImpl::

What do you mean by picking the one that''s correct, though?

Can I somehow use the probe id in the first column?

How do I discriminate in my dtrace code for the probe?

	Thanks, Joel

---
fastest mac firefox!
http://wagerlabs.com

Try adding -xmangled to your command line.

	James M

On Sep 11, 2009, at 4:31 PM, Joel Reymont wrote:
>
> On Sep 12, 2009, at 12:28 AM, Jonathan Adams wrote:
>
>> dtrace -l -n ''whatever''
>>
>> where ''whatever'' is the full probe spec for
nsComponentManagerImpl??
>> GetService*.
>>
>> Then, pick out the one which looks correct.
>
> I did this and I see
>
> 25833   pid39573               XUL non-virtual thunk to  
> nsComponentManagerImpl::GetService(nsID const&, nsID const&,  
> nsISupports**, nsIShutdownListener*) entry
> 25834   pid39573               XUL nsComponentManagerImpl::GetService 
> (nsID const&, nsID const&, nsISupports**, nsIShutdownListener*)
entry
> 25835   pid39573               XUL non-virtual thunk to  
> nsComponentManagerImpl::
>
> What do you mean by picking the one that''s correct, though?
>
> Can I somehow use the probe id in the first column?
>
> How do I discriminate in my dtrace code for the probe?
>
> 	Thanks, Joel
>
> ---
> fastest mac firefox!
> http://wagerlabs.com
>
>
>
>
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