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[SYCL] Fix error with type aliases used as free function kernel args #20123

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Merged
merged 2 commits into from
Sep 22, 2025
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Merged

[SYCL] Fix error with type aliases used as free function kernel args #20123

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7938a50
[SYCL] Fix error with type aliases used as free function kernel args
AlexeySachkov Sep 18, 2025
e327133
Add one more test case
AlexeySachkov Sep 18, 2025
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8 changes: 4 additions & 4 deletions clang/lib/Sema/SemaSYCL.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -6822,13 +6822,13 @@ class FreeFunctionPrinter {
continue;
}

TemplateName TN = TST->getTemplateName();
TemplateName CTN = CTST->getTemplateName();
CTN.getAsTemplateDecl()->printQualifiedName(ParmListOstream);
ParmListOstream << "<";

auto SpecArgs = TST->template_arguments();
auto DeclArgs = CTST->template_arguments();

TN.getAsTemplateDecl()->printQualifiedName(ParmListOstream);
ParmListOstream << "<";

for (size_t I = 0, E = std::max(DeclArgs.size(), SpecArgs.size()),
SE = SpecArgs.size();
I < E; ++I) {
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63 changes: 63 additions & 0 deletions clang/test/CodeGenSYCL/free-function-kernel-type-alias-arg.cpp
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@@ -0,0 +1,63 @@
// RUN: %clang_cc1 -fsycl-is-device -internal-isystem %S/Inputs -triple spir64-unknown-unknown -sycl-std=2020 -fsycl-int-header=%t.h %s
// RUN: FileCheck -input-file=%t.h %s
//
// The purpose of this test is to ensure that forward declarations of free
// function kernels are emitted properly.
// However, this test checks a specific scenario:
// - free function arguments are type aliases (through using or typedef)

namespace ns {

using IntUsing = int;
typedef int IntTypedef;

template <typename T>
struct Foo {};

using FooIntUsing = Foo<int>;
typedef Foo<int> FooIntTypedef;

template <typename T1, typename T2>
struct Bar {};

template<typename T1>
using BarUsing = Bar<T1, float>;

class Baz {
public:
using type = BarUsing<double>;
};

} // namespace ns

[[__sycl_detail__::add_ir_attributes_function("sycl-nd-range-kernel", 2)]]
void int_using(ns::IntUsing Arg) {}

// CHECK: void int_using(int Arg);

[[__sycl_detail__::add_ir_attributes_function("sycl-nd-range-kernel", 2)]]
void int_typedef(ns::IntTypedef Arg) {}

// CHECK: void int_typedef(int Arg);

[[__sycl_detail__::add_ir_attributes_function("sycl-nd-range-kernel", 2)]]
void foo_using(ns::FooIntUsing Arg) {}

// CHECK: void foo_using(ns::Foo<int> Arg);

[[__sycl_detail__::add_ir_attributes_function("sycl-nd-range-kernel", 2)]]
void foo_typedef(ns::FooIntTypedef Arg) {}

// CHECK: void foo_typedef(ns::Foo<int> Arg);

template<typename T>
[[__sycl_detail__::add_ir_attributes_function("sycl-nd-range-kernel", 2)]]
void bar_using(ns::BarUsing<T> Arg) {}
template void bar_using(ns::BarUsing<int>);
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@Fznamznon Fznamznon Sep 18, 2025 •
edited
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Does something like

class A {
    public:
    using B = int;
};

void freefu(A::B a) {

}

work?

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Yes, it works, I added it as a test case in e327133


// CHECK: template <typename T> void bar_using(ns::Bar<T, float>);

[[__sycl_detail__::add_ir_attributes_function("sycl-nd-range-kernel", 2)]]
void baz_type(ns::Baz::type Arg) {}

// CHECK: void baz_type(ns::Bar<double, float> Arg);
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