aaron.ballman added inline comments.
================
Comment at: clang/lib/AST/Interp/ByteCodeEmitter.cpp:24-31
+ bool HasBody = true;
+
+ // Function is not defined at all or not yet. We will
+ // create a Function instance but not compile the body. That
+ // will (maybe) happen later.
if (!FuncDecl->isDefined(FuncDecl) ||
(!FuncDecl->hasBody() && FuncDecl->willHaveBody()))
----------------
tbaeder wrote:
> aaron.ballman wrote:
> > .... negating the Boolean calculation and applying deMorgan's law did not
> > make that code more clear, did it (assuming I did everything right)? If you
> > agree, then I'm fine with the more complicated form and letting the
> > optimizer make it faster.
> I can see that going either way. I think your version is a more confusing
> though because the two body conditions are coupled with the `isDefined`
> condition. E.g. `HasBody` is `true` if `isDefined() && !willHaveBody()`,
> which doesn't make sense to me I think.
>
> I think I just read this code too many times now. How does being defined
> even relate to the function having a body? Should that code just be `HasBody
> = hasBody() || willHaveBody()`?
> I can see that going either way. I think your version is a more confusing
> though because the two body conditions are coupled with the isDefined
> condition. E.g. HasBody is true if isDefined() && !willHaveBody(), which
> doesn't make sense to me I think.
I'm glad we both are confused about the same thing!
> I think I just read this code too many times now. How does being defined even
> relate to the function having a body? Should that code just be HasBody =
> hasBody() || willHaveBody()?
I've not dug back in time to see how we got to that predicate in the first
place, but my *hunch* is that this may have to do with implicit function
definitions for things like special member functions. That's a case where you
can have a function definition without a body. e.g.,
```
struct S {
S();
};
S::S() = default;
```
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D136936/new/
https://reviews.llvm.org/D136936
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