[OPENMP] Codegen for `omp declare target` construct.

Added initial codegen for device side of declarations inside `omp
declare target` construct + codegen for implicit `declare target`
functions, which are used in the target regions.

llvm-svn: 327636

1 files changed, 12 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index e75780a0a93..3c503eb66fa 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -2383,6 +2383,12 @@ llvm::Constant *CodeGenModule::GetOrCreateLLVMFunction(
   // Any attempts to use a MultiVersion function should result in retrieving
   // the iFunc instead. Name Mangling will handle the rest of the changes.
   if (const FunctionDecl *FD = cast_or_null<FunctionDecl>(D)) {
+    // For the device mark the function as one that should be emitted.
+    if (getLangOpts().OpenMPIsDevice && OpenMPRuntime &&
+        !OpenMPRuntime->markAsGlobalTarget(FD) && FD->isDefined() &&
+        !DontDefer && !IsForDefinition)
+      addDeferredDeclToEmit(GD);
+
     if (FD->isMultiVersion() && FD->getAttr<TargetAttr>()->isDefaultVersion()) {
       UpdateMultiVersionNames(GD, FD);
       if (!IsForDefinition)
@@ -3072,6 +3078,12 @@ void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D,
   if (getLangOpts().OpenCL && ASTTy->isSamplerT())
     return;
 
+  // If this is OpenMP device, check if it is legal to emit this global
+  // normally.
+  if (LangOpts.OpenMPIsDevice && OpenMPRuntime &&
+      OpenMPRuntime->emitTargetGlobalVariable(D))
+    return;
+
   llvm::Constant *Init = nullptr;
   CXXRecordDecl *RD = ASTTy->getBaseElementTypeUnsafe()->getAsCXXRecordDecl();
   bool NeedsGlobalCtor = false;