dtrace discuss - Mar 2008 - dtrace -h drops const qualifier from the probe spec..

Hi

Is there a valid reason for why dtrace -h removes the const qualifier?

provider foo {
    probe bar(const void*);
};

The signature in the generated header-file generated by dtrace -hs  
foo.d looks like:

extern void __dtrace_foo___bar(void *);

Why is the const qualifier removed? Is this a bug or a "feature"?

I am getting compiler warnings since I am passing const-variables to  
my probes, and I don''t want to add a cast just to get rid of the  
warning...

Trond

On Wed, Mar 05, 2008 at 10:51:32AM +0100, Trond Norbye
wrote:
> Hi
> 
> Is there a valid reason for why dtrace -h removes the const qualifier?
> 
> provider foo {
>     probe bar(const void*);
> };
> 
> The signature in the generated header-file generated by dtrace -hs  
> foo.d looks like:
> 
> extern void __dtrace_foo___bar(void *);
> 
> Why is the const qualifier removed? Is this a bug or a "feature"?
This is a bug. You filed it in 2006:

  6460581 dtrace -h drops const qualifier in the generated function prototypes

It''s kind of a pain to fix, but I''ll try to bump it up in the
queue. It should
just be a matter of tinkering with dt_decl_type(), but dealing with all the
different ways you can apply const (e.g. const char const *) will be tricky.

Adam

-- 
Adam Leventhal, Fishworks                        http://blogs.sun.com/ahl

On Mar 5, 2008, at 8:27 PM, Adam Leventhal wrote:
> On Wed, Mar 05, 2008 at 10:51:32AM +0100, Trond Norbye wrote:
>> Hi
>>
>> Is there a valid reason for why dtrace -h removes the const  
>> qualifier?
>>
>> provider foo {
>>    probe bar(const void*);
>> };
>>
>> The signature in the generated header-file generated by dtrace -hs
>> foo.d looks like:
>>
>> extern void __dtrace_foo___bar(void *);
>>
>> Why is the const qualifier removed? Is this a bug or a
"feature"?
>
> This is a bug. You filed it in 2006:
>
>  6460581 dtrace -h drops const qualifier in the generated function  
> prototypes
>
> It''s kind of a pain to fix, but I''ll try to bump it up in
the queue.
> It should
> just be a matter of tinkering with dt_decl_type(), but dealing with  
> all the
> different ways you can apply const (e.g. const char const *) will be  
> tricky.
Thank you :-)

I had totally forgot that I filed it, and I didn''t see it when I did a
quick search today.. How could I miss that! I guess that I need to get  
new glasses ;)

Trond