[OPENMP] Codegen for threadprivate variables

For all threadprivate variables which have constructor/destructor emit call to void __kmpc_threadprivate_register(ident_t * <Current Location>, void *<Original Global Addr>, kmpc_ctor <Constructor>, kmpc_cctor NULL, kmpc_dtor <Destructor>); 
In expressions all references to such variables are replaced by calls to void *__kmpc_threadprivate_cached(ident_t *<Current Location>, kmp_int32 <Current Thread Id>, void *<Original Global Addr>, size_t <Size of Data>, void ***<Pointer to autogenerated cache – array of private copies of threadprivate variable>);
Test test/OpenMP/threadprivate_codegen.cpp checks that codegen is correct. Also it checks that codegen is correct after serialization/deserialization and one of passes verifies debug info.
Differential Revision: http://reviews.llvm.org/D4002

llvm-svn: 221663

clang/lib/CodeGen/CodeGenModule.cpp

@@ -3230,6 +3230,10 @@ void CodeGenModule::EmitTopLevelDecl(Decl *D) {
     break;
   }
 
+  case Decl::OMPThreadPrivate:
+    EmitOMPThreadPrivateDecl(cast<OMPThreadPrivateDecl>(D));
+    break;
+
   case Decl::ClassTemplateSpecialization: {
     const auto *Spec = cast<ClassTemplateSpecializationDecl>(D);
     if (DebugInfo &&
@@ -3506,3 +3510,18 @@ llvm::Constant *CodeGenModule::GetAddrOfRTTIDescriptor(QualType Ty,
   return getCXXABI().getAddrOfRTTIDescriptor(Ty);
 }
 
+void CodeGenModule::EmitOMPThreadPrivateDecl(const OMPThreadPrivateDecl *D) {
+  for (auto RefExpr : D->varlists()) {
+    auto *VD = cast<VarDecl>(cast<DeclRefExpr>(RefExpr)->getDecl());
+    bool PerformInit =
+        VD->getAnyInitializer() &&
+        !VD->getAnyInitializer()->isConstantInitializer(getContext(),
+                                                        /*ForRef=*/false);
+    if (auto InitFunction =
+            getOpenMPRuntime().EmitOMPThreadPrivateVarDefinition(
+                VD, GetAddrOfGlobalVar(VD), RefExpr->getLocStart(),
+                PerformInit))
+      CXXGlobalInits.push_back(InitFunction);
+  }
+}
+