[PATCH] D133361: [BPF] Attribute preserve_static_offset for structs

[Erich Keane via Phabricator via cfe-commits]

erichkeane added inline comments.


================
Comment at: clang/lib/CodeGen/CGExpr.cpp:3701
+  QualType PointeeType = E->getType()->getPointeeType();
+  if (PointeeType.isNull())
+    return false;
----------------
eddyz87 wrote:
> erichkeane wrote:
> > We override `operator bool` to make this work.
> Sorry, just to clarify, currently such modification fails with the following error:
> 
> ```
> lang=c++
> clang/lib/CodeGen/CGExpr.cpp:3710:7: error: invalid argument type 'QualType' to unary expression
>   if (!PointeeType)
>       ^~~~~~~~~~~~
> 1 error generated.
> ```
> 
> And you want me to modify `QualType` as follows:
> 
> ```
> --- a/clang/include/clang/AST/Type.h
> +++ b/clang/include/clang/AST/Type.h
> @@ -796,6 +796,8 @@ public:
>      return getTypePtr();
>    }
>  
> +  explicit operator bool() const { return isNull(); }
> +
>    bool isCanonical() const;
>    bool isCanonicalAsParam() const;
> ```
> 
> Right?
No, don't do that, you can leave it just checking isNull.  I could have sworn we already had that operator, but perhaps it was removed at one point.


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  https://reviews.llvm.org/D133361/new/

https://reviews.llvm.org/D133361