[cfe-dev] Static Assertions inside VarDecl constructor

[David Majnemer]

On Tue, Jun 2, 2015 at 9:24 AM, Amila Jayasekara <thejaka.amila at gmail.com>
wrote:

> Hello,
>
> Inside VarDecl constructor (Decl.cpp L1721 in Clang 3.6) there are 2
> static assertions as follows;
>
> VarDecl::VarDecl(Kind DK, ASTContext &C, DeclContext *DC,...) {
>
>   static_assert(sizeof(VarDeclBitfields) <= sizeof(unsigned),
>           "VarDeclBitfields too large!");
>   static_assert(sizeof(ParmVarDeclBitfields) <= sizeof(unsigned),
>           "ParmVarDeclBitfields too large!");
>   ...
> }
>
> I am trying to add an another field to VarDeclBitfields and it triggers
> second static assertion in above code.
>

I made more room in r237648:
http://llvm.org/viewvc/llvm-project?view=revision&revision=237648


>
> Could you please explain why sizeof VarDeclBitfields and
> ParmVarDeclBitfields must be less than sizeof(unsigned) and also what are
> repercussions if I remove above assertions ?
>
> Thanks
> -Thejaka
>
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