jingham added a comment.

In D59854#1443915 <https://reviews.llvm.org/D59854#1443915>, @zturner wrote:

> In D59854#1443906 <https://reviews.llvm.org/D59854#1443906>, @jingham wrote:
>
> > In D59854#1443904 <https://reviews.llvm.org/D59854#1443904>, @JDevlieghere 
> > wrote:
> >
> > > In D59854#1443891 <https://reviews.llvm.org/D59854#1443891>, @jingham 
> > > wrote:
> > >
> > > > It isn't safe to pass "data()" of a StringRef to dlsym.
> > >
> > >
> > > Why?
> >
> >
> > StringRef's aren't guaranteed to be NULL terminated.  Or rather, the Data 
> > that gets returned by the data() method is just the raw pointer in the 
> > StringRef, which isn't guaranteed to be NULL terminated.
>
>
> While true, I don't think this is a good reason to make the interface accept 
> a `const char*`, because that means that the interface is exposing an 
> implementation detail.  Instead, the interface should accept a `StringRef`, 
> and the implementation can pass `foo.str().c_str()`.  It might be slightly 
> less efficient (almost to the point of minutia), but this isn't really 
> performance sensitive code, as loading the library will dominate the call to 
> malloc / memcpy.


I don't actually care one way or the other about using a StringRef here (though 
I still think it is odd to have the library be a char * and the symbol a 
StringRef...).  I was only concerned that you can't pass the data() of a 
StringRef to anything that expects a c-string.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D59854/new/

https://reviews.llvm.org/D59854



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