diff options
Diffstat (limited to 'test/SemaCUDA/function-template-overload.cu')
| -rw-r--r-- | test/SemaCUDA/function-template-overload.cu | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/test/SemaCUDA/function-template-overload.cu b/test/SemaCUDA/function-template-overload.cu new file mode 100644 index 000000000000..56bba653958c --- /dev/null +++ b/test/SemaCUDA/function-template-overload.cu @@ -0,0 +1,113 @@ +// RUN: %clang_cc1 -std=c++11 -triple x86_64-unknown-linux-gnu -fsyntax-only -verify %s +// RUN: %clang_cc1 -std=c++11 -triple nvptx64-nvidia-cuda -fsyntax-only -fcuda-is-device -verify %s + +#include "Inputs/cuda.h" + +struct HType {}; // expected-note-re 6 {{candidate constructor {{.*}} not viable: no known conversion from 'DType'}} +struct DType {}; // expected-note-re 6 {{candidate constructor {{.*}} not viable: no known conversion from 'HType'}} +struct HDType {}; + +template <typename T> __host__ HType overload_h_d(T a) { return HType(); } +// expected-note@-1 2 {{candidate template ignored: could not match 'HType' against 'DType'}} +// expected-note@-2 2 {{candidate template ignored: target attributes do not match}} +template <typename T> __device__ DType overload_h_d(T a) { return DType(); } +// expected-note@-1 2 {{candidate template ignored: could not match 'DType' against 'HType'}} +// expected-note@-2 2 {{candidate template ignored: target attributes do not match}} + +// Check explicit instantiation. +template __device__ __host__ DType overload_h_d(int a); // There's no HD template... +// expected-error@-1 {{explicit instantiation of 'overload_h_d' does not refer to a function template, variable template, member function, member class, or static data member}} +template __device__ __host__ HType overload_h_d(int a); // There's no HD template... +// expected-error@-1 {{explicit instantiation of 'overload_h_d' does not refer to a function template, variable template, member function, member class, or static data member}} +template __device__ DType overload_h_d(int a); // OK. instantiates D +template __host__ HType overload_h_d(int a); // OK. instantiates H + +// Check explicit specialization. +template <> __device__ __host__ DType overload_h_d(long a); // There's no HD template... +// expected-error@-1 {{no function template matches function template specialization 'overload_h_d'}} +template <> __device__ __host__ HType overload_h_d(long a); // There's no HD template... +// expected-error@-1 {{no function template matches function template specialization 'overload_h_d'}} +template <> __device__ DType overload_h_d(long a); // OK. instantiates D +template <> __host__ HType overload_h_d(long a); // OK. instantiates H + + +// Can't overload HD template with H or D template, though +// non-template functions are OK. +template <typename T> __host__ __device__ HDType overload_hd(T a) { return HDType(); } +// expected-note@-1 {{previous declaration is here}} +// expected-note@-2 2 {{candidate template ignored: could not match 'HDType' against 'HType'}} +template <typename T> __device__ HDType overload_hd(T a); +// expected-error@-1 {{__device__ function 'overload_hd' cannot overload __host__ __device__ function 'overload_hd'}} +__device__ HDType overload_hd(int a); // OK. + +// Verify that target attributes are taken into account when we +// explicitly specialize or instantiate function tempaltes. +template <> __host__ HType overload_hd(int a); +// expected-error@-1 {{no function template matches function template specialization 'overload_hd'}} +template __host__ HType overload_hd(long a); +// expected-error@-1 {{explicit instantiation of 'overload_hd' does not refer to a function template, variable template, member function, member class, or static data member}} +__host__ HType overload_hd(int a); // OK + +template <typename T> __host__ T overload_h(T a); // expected-note {{previous declaration is here}} +template <typename T> __host__ __device__ T overload_h(T a); +// expected-error@-1 {{__host__ __device__ function 'overload_h' cannot overload __host__ function 'overload_h'}} +template <typename T> __device__ T overload_h(T a); // OK. D can overload H. + +template <typename T> __host__ HType overload_h_d2(T a) { return HType(); } +template <typename T> __host__ __device__ HDType overload_h_d2(T a) { return HDType(); } +template <typename T1, typename T2 = int> __device__ DType overload_h_d2(T1 a) { T1 x; T2 y; return DType(); } + +// constexpr functions are implicitly HD, but explicit +// instantiation/specialization must use target attributes as written. +template <typename T> constexpr T overload_ce_implicit_hd(T a) { return a+1; } +// expected-note@-1 3 {{candidate template ignored: target attributes do not match}} + +// These will not match the template. +template __host__ __device__ int overload_ce_implicit_hd(int a); +// expected-error@-1 {{explicit instantiation of 'overload_ce_implicit_hd' does not refer to a function template, variable template, member function, member class, or static data member}} +template <> __host__ __device__ long overload_ce_implicit_hd(long a); +// expected-error@-1 {{no function template matches function template specialization 'overload_ce_implicit_hd'}} +template <> __host__ __device__ constexpr long overload_ce_implicit_hd(long a); +// expected-error@-1 {{no function template matches function template specialization 'overload_ce_implicit_hd'}} + +// These should work, because template matching ignores the implicit +// HD attributes the compiler gives to constexpr functions/templates, +// so 'overload_ce_implicit_hd' template will match __host__ functions +// only. +template __host__ int overload_ce_implicit_hd(int a); +template <> __host__ long overload_ce_implicit_hd(long a); + +template float overload_ce_implicit_hd(float a); +template <> float* overload_ce_implicit_hd(float *a); +template <> constexpr double overload_ce_implicit_hd(double a) { return a + 3.0; }; + +__host__ void hf() { + overload_hd(13); + overload_ce_implicit_hd('h'); // Implicitly instantiated + overload_ce_implicit_hd(1.0f); // Explicitly instantiated + overload_ce_implicit_hd(2.0); // Explicitly specialized + + HType h = overload_h_d(10); + HType h2i = overload_h_d2<int>(11); + HType h2ii = overload_h_d2<int>(12); + + // These should be implicitly instantiated from __host__ template returning HType. + DType d = overload_h_d(20); // expected-error {{no viable conversion from 'HType' to 'DType'}} + DType d2i = overload_h_d2<int>(21); // expected-error {{no viable conversion from 'HType' to 'DType'}} + DType d2ii = overload_h_d2<int>(22); // expected-error {{no viable conversion from 'HType' to 'DType'}} +} +__device__ void df() { + overload_hd(23); + overload_ce_implicit_hd('d'); // Implicitly instantiated + overload_ce_implicit_hd(1.0f); // Explicitly instantiated + overload_ce_implicit_hd(2.0); // Explicitly specialized + + // These should be implicitly instantiated from __device__ template returning DType. + HType h = overload_h_d(10); // expected-error {{no viable conversion from 'DType' to 'HType'}} + HType h2i = overload_h_d2<int>(11); // expected-error {{no viable conversion from 'DType' to 'HType'}} + HType h2ii = overload_h_d2<int>(12); // expected-error {{no viable conversion from 'DType' to 'HType'}} + + DType d = overload_h_d(20); + DType d2i = overload_h_d2<int>(21); + DType d2ii = overload_h_d2<int>(22); +} |