yaxunl added inline comments.
================
Comment at: cfe/trunk/lib/Basic/TargetInfo.cpp:351
+LangAS::ID TargetInfo::getOpenCLTypeAddrSpace(const Type *T) const {
+ auto BT = dyn_cast<BuiltinType>(T);
----------------
rsmith wrote:
> Anastasia wrote:
> > chapuni wrote:
> > > Excuse me for old commit, I think it might be layering violation.
> > > Could we avoid using AST/Type here?
> > One of the problems is that even if we could write another layer of enums
> > to map OpenCL specific AST types into the TargetInfo representation it
> > doesn't really help creating a layered structure between AST and Basic
> > libs. They seem to have a large logical dependence despite not including
> > the library headers physically. So modification in AST would require
> > modifications in Basic anyway resulting in overhead of changing 2 places
> > instead of 1. So I am wondering if there is any better approach here e.g.
> > revisiting the library dependencies or what classes they should contain?
> I don't know what large logical dependencies you're talking about here.
> `Basic` is supposed to be answering questions about lowering that are
> independent of our choice of AST model. It should never look at a
> `clang::Type` for any reason to do this, and should never need to do so. If
> you find it does need to do so, you're asking the `TargetInfo` questions at
> the wrong level of abstraction.
>
> As far as I can see, there's only one question you actually need to ask the
> `TargetInfo` here, and that's whether builtin types are in the
> `opencl_global` or `opencl_constant` address space.
This function has been expanded to include more types and the returned address
space is not limited to global/constant.
I think we need some enum definition in TargetInfo.h for OpenCL types with
target-dependent address spaces, as Anastasia suggested before, e.g.
```
enum OpenCLTypeKindWithTargetDependentAddrSpace {
Default,
Image,
Sampler,
//...
};
```
Then define this function with the enum as parameter. Then add a function to
ASTContext to map AST types to the enum.
```
Repository:
rL LLVM
https://reviews.llvm.org/D33989
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