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clang/test/SemaCUDA/lambda.cu

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// RUN: %clang_cc1 -std=c++17 -fsyntax-only -verify=com %s
// RUN: %clang_cc1 -std=c++17 -fsyntax-only -fcuda-is-device -verify=com,dev %s
#include "Inputs/cuda.h"
auto global_lambda = [] () { return 123; };
template<class F>
__global__ void kernel(F f) { f(); }
// dev-note@-1 7{{called by 'kernel<(lambda}}
__host__ __device__ void hd(int x);
class A {
int b;
public:
void test() {
[=](){ hd(b); }();
[&](){ hd(b); }();
kernel<<<1,1>>>([](){ hd(0); });
kernel<<<1,1>>>([=](){ hd(b); });
// dev-error@-1 {{capture host side class data member by this pointer in device or host device lambda function}}
kernel<<<1,1>>>([&](){ hd(b); });
// dev-error@-1 {{capture host side class data member by this pointer in device or host device lambda function}}
pfultz2Unsubmitted
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Will this still produce diagnostics when the lambda is explicitly __device__? Maybe you could add a test case for that.

kernel<<<1,1>>>([&]() __device__ { hd(b); });
pfultz2: Will this still produce diagnostics when the lambda is explicitly `__device__`? Maybe you could…
yaxunlAuthorUnsubmitted
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yes. added a test

yaxunl: yes. added a test
kernel<<<1,1>>>([&] __device__ (){ hd(b); });
// dev-error@-1 {{capture host side class data member by this pointer in device or host device lambda function}}
kernel<<<1,1>>>([&](){
auto f = [&]{ hd(b); };
// dev-error@-1 {{capture host side class data member by this pointer in device or host device lambda function}}
f();
traUnsubmitted
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We may need a better diagnostic for this. Here we've correctly rejected captured lambdas, but the diagnostic is a generic 'can't use that'.
If would be helpful to let user know that we can't use that because of the capturing lambdas.

tra: We may need a better diagnostic for this. Here we've correctly rejected captured lambdas, but…
yaxunlAuthorUnsubmitted
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added more information about lambda function to the diagnostic message

yaxunl: added more information about lambda function to the diagnostic message
});
}
};
int main(void) {
auto lambda_kernel = [&]__global__(){};
// com-error@-1 {{kernel function 'operator()' must be a free function or static member function}}
int b;
[&](){ hd(b); }();
[=, &b](){ hd(b); }();
kernel<<<1,1>>>(global_lambda);
kernel<<<1,1>>>([](){ hd(0); });
kernel<<<1,1>>>([=](){ hd(b); });
kernel<<<1,1>>>([b](){ hd(b); });
kernel<<<1,1>>>([&](){ hd(b); });
// dev-error@-1 {{capture host variable 'b' by reference in device or host device lambda function}}
kernel<<<1,1>>>([=, &b](){ hd(b); });
// dev-error@-1 {{capture host variable 'b' by reference in device or host device lambda function}}
kernel<<<1,1>>>([&, b](){ hd(b); });
kernel<<<1,1>>>([&](){
auto f = [&]{ hd(b); };
// dev-error@-1 {{capture host variable 'b' by reference in device or host device lambda function}}
f();
});
return 0;
}