[cfe-dev] Clang and CUDA with C++11 features

[Peter Colberg]

On Wed, Jun 13, 2012 at 09:35:10PM -0700, Sean Silva wrote:
> On Wed, Jun 13, 2012 at 8:28 PM, Peter Colberg <peter at colberg.org> wrote:
> > The parser interprets the compressed C++11 template parameter syntax
> > as a call to a CUDA kernel function. Is there a way to disable parsing
> > of the CUDA call syntax <<< >>>? I would be using a C++ wrapper around
> > cudaConfigureCall, cudaSetupArgument and cudaLaunch anyway.
>
> Try:
> 
> find $HEADER_DIR | xargs sed --i.bak -e 's/>>>/> > >/'
> 
> I don't think there are any syntactic dark corners where that will break
> otherwise valid C++.
> 
> No guarantees though (that's what the -i.bak is for ;).

The other way around: CUDA violates the C++ standard with regard to
template parameter syntax, so I would like to disable the CUDA
execution syntax, and use cudaLaunch with a pointer instead.

The lexer of Clang is straight-forward :-).

--- lib/Lex/Lexer.cpp      2012-06-14 10:48:34.675569175 -0400
+++ lib/Lex/Lexer.cpp   2012-06-14 10:48:51.246645348 -0400
@@ -3054,10 +3054,6 @@
         // If this is '<<<<' and we're in a Perforce-style conflict marker,
         // ignore it.
         goto LexNextToken;
-      } else if (LangOpts.CUDA && After == '<') {
-        Kind = tok::lesslessless;
-        CurPtr = ConsumeChar(ConsumeChar(CurPtr, SizeTmp, Result),
-                             SizeTmp2, Result);
       } else {
         CurPtr = ConsumeChar(CurPtr, SizeTmp, Result);
         Kind = tok::lessless;
@@ -3110,10 +3106,6 @@
       } else if (After == '>' && HandleEndOfConflictMarker(CurPtr-1)) {
         // If this is '>>>>>>>' and we're in a conflict marker, ignore it.
         goto LexNextToken;
-      } else if (LangOpts.CUDA && After == '>') {
-        Kind = tok::greatergreatergreater;
-        CurPtr = ConsumeChar(ConsumeChar(CurPtr, SizeTmp, Result),
-                             SizeTmp2, Result);
       } else {
         CurPtr = ConsumeChar(CurPtr, SizeTmp, Result);
         Kind = tok::greatergreater;

Peter