[CUDA] Make lambdas inherit __host__ and __device__ attributes from the scope in which they're created.

Summary: NVCC compat.  Fixes bug 30567.

Reviewers: tra

Subscribers: cfe-commits, rnk

Differential Revision: https://reviews.llvm.org/D25105

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@282880 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 19 insertions, 0 deletions

diff --git a/lib/Sema/SemaCUDA.cpp b/lib/Sema/SemaCUDA.cpp
index c75bdc7f59..293baa55e0 100644
--- a/lib/Sema/SemaCUDA.cpp
+++ b/lib/Sema/SemaCUDA.cpp
@@ -559,3 +559,22 @@ bool Sema::CheckCUDAVLA(SourceLocation Loc) {
   }
   return true;
 }
+
+void Sema::CUDASetLambdaAttrs(CXXMethodDecl *Method) {
+  if (Method->hasAttr<CUDAHostAttr>() || Method->hasAttr<CUDADeviceAttr>())
+    return;
+  FunctionDecl *CurFn = dyn_cast<FunctionDecl>(CurContext);
+  if (!CurFn)
+    return;
+  CUDAFunctionTarget Target = IdentifyCUDATarget(CurFn);
+  if (Target == CFT_Global || Target == CFT_Device) {
+    Method->addAttr(CUDADeviceAttr::CreateImplicit(Context));
+  } else if (Target == CFT_HostDevice) {
+    Method->addAttr(CUDADeviceAttr::CreateImplicit(Context));
+    Method->addAttr(CUDAHostAttr::CreateImplicit(Context));
+  }
+
+  // TODO: nvcc doesn't allow you to specify __host__ or __device__ attributes
+  // on lambdas in all contexts -- we should emit a compatibility warning where
+  // we're more permissive.
+}