sdefresne added a comment.
In http://reviews.llvm.org/D20113#425984, @rjmccall wrote:
> This is a good catch, thanks!
Thank you for the quick reply.
Please excuse me if I misunderstood you or if my remark appear off the mark,
this is my first time sending patches to clang. I'm not yet completely familiar
with all clang concepts :-)
> As a slight adjustment, It's probably better to just ignore this attribute
> when mangling the function type of an entity, the same way that we generally
> don't mangle return types because they don't affect overloading. That will
> require an extra flag to be passed down in a few places, but that's pretty
> reasonable. This will generally allow NS_CONSUMED and NS_RETURNS_RETAINED to
> be placed on existing APIs without changing their mangling unless the
> attribute is used in a secondary position (such as the type of an argument).
>
> Finally, you should give ns_returns_retained the same treatment, as well as
> the parameter-ABI attributes.
I'm not really sure what you mean by "ignore this attribute when mangling the
function type of an entity". I read this as "we should ensure that the
ns_consumed attribute is only mangled if it is applied to a parameter". Is this
correct?
If so, then there is nothing to do, as "ns_consumed" attibute is ignored if
applied to a non-parameter type as far as I can tell (see below for compilation
warning clang already emits regarding ignored attributes). So, my understanding
is that the ns_consumed attribute is only used if applied to a parameter, and
thus only when it is relevant to include it in the mangled name.
Regarding ns_returns_retained, it is ignored if not applied to the function
itself.
$ clang++ -fobjc-arc -o x.o -c x.mm
x.mm:1:19: warning: 'ns_consumed' attribute only applies to parameters
[-Wignored-attributes]
id __attribute__((ns_consumed)) f() { return 0; }
^
x.mm:2:23: warning: 'ns_consumed' attribute only applies to parameters
[-Wignored-attributes]
id g() __attribute__((ns_consumed)) { return 0; }
^
x.mm:7:26: warning: 'ns_returns_retained' only applies to function types; type
here is 'id' [-Wignored-attributes]
void k(id __attribute__((ns_returns_retained))) {}
So, could you elaborate a bit more on what additional changes I need to make to
my patch?
http://reviews.llvm.org/D20113
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