[llvm-dev] CUDA kernel call with template parameters not appearing in Clang AST (original) (raw)

Michael Ehmke via llvm-dev llvm-dev at lists.llvm.org
Wed Nov 29 06:05:00 PST 2017

Hi Justin,

Thanks so much for the response. I'll try that out and get back to you.

Sincerely, Michael Ehmke

On Wed, Nov 29, 2017, 12:06 AM Justin Lebar <jlebar at google.com> wrote:

Hi, Michael.

Are you able to create a reduced testcase which demonstrates your problem? I tried template global void Kernel() {} void test() { Kernel<16><<<100, 200>>>(); } which I compiled with $ clang -c -Xclang -ast-dump test.cu and the AST looks fine to me -- the CUDAKernelCallExpr shows up as expected. -Justin On Tue, Nov 28, 2017 at 2:33 PM Michael Ehmke via llvm-dev <_ _llvm-dev at lists.llvm.org> wrote:

Hello all,

I'm using Clang and am trying to refactor CUDA code. I want to traverse the AST to access a CUDAKernelCallExpr node where the kernel call has template parameters. I have been able to successfully match on and access CUDA kernel calls which have no template parameters by using the AST matchers to match on a CUDAKernelCallExpr. However, when my code comes across a kernel call with template parameters, it appears that the expression is not even existent in the AST when it is dumped. This is the expression that I'm having trouble parsing: ex. matrixMulCUDA<16><<< grid, threads >>>(dC, dA, dB, dimsA.x, dimsB.x); This expression does not show up at all in the AST when dumping the AST. I have been able to successfully parse the following kernel call expression and it shows up in the AST as a "CudaKernelCallExpr" node. ex. matrixMulCUDA<<< grid, threads >>>(dC, dA, dB, dimsA.x, dimsB.x); As you can see, the only difference is the <16> after the name of the call, and this node is clearly represented in the AST. Here is a screenshot showing the lack of a node to represent the call with template parameters. [image: image.png] If I could get any assistance on why this is happening, I would appreciate it greatly. Thank you, Michael Ehmke

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