[SYCL] Fix incorrect line information in SYCL device code debug info

Mark the SYCL kernel as artificial to avoid inheriting the source correlation
from the surrounding code.

Signed-off-by: Wyma, Brock <[email protected]>
Signed-off-by: Vladimir Lazarev <[email protected]>

Author: bwyma

clang/lib/Sema/SemaSYCL.cpp

@@ -393,6 +393,8 @@ static FunctionDecl *CreateSYCLKernelFunction(ASTContext &Context,
   SYCLKernel->addAttr(SYCLDeviceAttr::CreateImplicit(Context));
   SYCLKernel->addAttr(OpenCLKernelAttr::CreateImplicit(Context));
   SYCLKernel->addAttr(AsmLabelAttr::CreateImplicit(Context, Name));
+  SYCLKernel->addAttr(ArtificialAttr::CreateImplicit(Context));
+
   // To see kernel in AST-dump.
   DC->addDecl(SYCLKernel);
   return SYCLKernel;

clang/test/CodeGenSYCL/debug-info-srcpos-kernel.cpp

@@ -0,0 +1,29 @@
+// RUN: %clang --sycl %s -S -emit-llvm -g -o - | FileCheck %s
+//
+// Verify the SYCL kernel routine is marked artificial.
+//
+// Since it has no source correlation of its own, the SYCL kernel needs to be
+// marked artificial or it will inherit source correlation from the surrounding
+// code.
+//
+
+template <typename Name, typename Func>
+__attribute__((sycl_kernel)) void kernel_single_task(Func kernelFunc) {
+  kernelFunc();
+}
+
+int main() {
+  int value = 0;
+  int* captured = &value;
+  kernel_single_task<class kernel_function>([=]() {
+      *captured = 1;
+      });
+  return 0;
+}
+
+// CHECK: define{{.*}} spir_kernel {{.*}}void @_ZTSZ4mainE15kernel_function(i32*{{.*}}){{.*}} !dbg [[KERNEL:![0-9]+]] {{.*}}{
+// CHECK: [[FILE:![0-9]+]] = !DIFile(filename: "{{.*}}debug-info-srcpos-kernel.cpp"{{.*}})
+// CHECK: [[KERNEL]] = {{.*}}!DISubprogram(name: "_ZTSZ4mainE15kernel_function"
+// CHECK-SAME: scope: [[FILE]]
+// CHECK-SAME: file: [[FILE]]
+// CHECK-SAME: flags: DIFlagArtificial | DIFlagPrototyped