CUDA: add -fcuda-is-device flag

This frontend-only flag is used by the IR generator to determine
whether to filter CUDA declarations for the host or for the device.

llvm-svn: 141301

1 files changed, 17 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index f5e37897bcb..d8b9c9d853c 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -785,6 +785,23 @@ void CodeGenModule::EmitGlobal(GlobalDecl GD) {
   if (Global->hasAttr<AliasAttr>())
     return EmitAliasDefinition(GD);
 
+  // If this is CUDA, be selective about which declarations we emit.
+  if (Features.CUDA) {
+    if (CodeGenOpts.CUDAIsDevice) {
+      if (!Global->hasAttr<CUDADeviceAttr>() &&
+          !Global->hasAttr<CUDAGlobalAttr>() &&
+          !Global->hasAttr<CUDAConstantAttr>() &&
+          !Global->hasAttr<CUDASharedAttr>())
+        return;
+    } else {
+      if (!Global->hasAttr<CUDAHostAttr>() && (
+            Global->hasAttr<CUDADeviceAttr>() ||
+            Global->hasAttr<CUDAConstantAttr>() ||
+            Global->hasAttr<CUDASharedAttr>()))
+        return;
+    }
+  }
+
   // Ignore declarations, they will be emitted on their first use.
   if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Global)) {
     // Forward declarations are emitted lazily on first use.