[cfe-dev] [Review request] CUDA patch series 3 (was Re: Proposal: CUDA support; outline, initial patches)

[Peter Collingbourne]

Hi,

+cfe-commits, as I think this series is now ready for pre-commit review.

This new patch series replaces series 1 and 2 entirely, and includes
the following changes:

 - Driver and Frontend support for the .cu file extension and '-x cuda',
   which both enable CUDA features.

 - Improved parsing error recovery for kernel call expressions.

 - Added a few diagnostics related to global functions and kernel calls.

 - Redesigned CUDAKernelCallExpr to store cudaConfigureCall function
   call as a subexpression.  The cudaConfigureCall declaration is
   now also used to parse the execution configuration.  This has
   a number of advantages:

   - Reduces hardcoded surface area
   - Same behaviour as NVIDIA toolchain
   - Therefore future-proof; if the cudaConfigureCall parameter list
     changes, there is no need to change CUDAKernelCallExpr
   - Simplifies CUDAKernelCallExpr::child_end() which before needed
     to take care with optional subexpressions
   - Can utilise existing support (Sema and CodeGen) for CallExprs

 - CodeGen support for CUDAKernelCallExpr.  This calls cudaConfigureCall
   to set the execution configuration before calling the global function
   (currently not CodeGen'd for the host).

 - Added small test suite, which tests Parse, Sema and CodeGen.

Future work:

 - Host-side CodeGen support for global functions.  This will involve
   generating a local device stub which uses cudaSetupArgument and
   cudaLaunch to set up the argument vector and launch the kernel,
   similar to the NVIDIA toolchain.

Reviews appreciated.

Thanks,
-- 
Peter
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