[cfe-dev] Pointer Arithmetic

[Steve Naroff]

+    // How does one find the size of a QualType, or the llvm::Type it
+    // corresponds to?

Keith,

Currently, clang::BuiltinType is the only type that knows it's size  
(see getSize()).

Eventually, getSize() will be implemented by clang::Type (the root of  
the type hierarchy).

The main "gotcha" (with implementing it in Type) is struct layout  
(which is none trivial and target specific).

snaroff

On Jul 12, 2007, at 2:25 AM, Keith Bauer wrote:

> I've been working on pointer arithmetic.  Attached is a patch which
> seems to correctly implement (pointer + int), (int + pointer) and
> (pointer - int).  (pointer - pointer) doesn't seem to be possible
> within the infrastructure that exists, though I'd like confirmation of
> this.  See my comments in the patch.
>
> Obviously, since this is my first effort, I'd like comments on what
> I've done well and what I've (inevitably) done poorly.  I'm not really
> sure of the design or coding conventions of the project.
>
> Also, there's no test-cases.  I haven't figured out how they're
> supposed to work yet.
>
> -Keith
> <PointerMath.diff>
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