Do the guarding of instantiated static data members

on if its linkage is weak. Currently this is the
case but may change in the future. (part of radar 
8562966).

llvm-svn: 117452

1 files changed, 28 insertions, 19 deletions

diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index d35965e2c4e..efcdce70a05 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -1154,42 +1154,51 @@ void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D) {
     GV->setConstant(true);
 
   GV->setAlignment(getContext().getDeclAlign(D).getQuantity());
-
+  
   // Set the llvm linkage type as appropriate.
+  llvm::GlobalValue::LinkageTypes Linkage = 
+    GetLLVMLinkageVarDefinition(D, GV);
+  GV->setLinkage(Linkage);
+  if (Linkage == llvm::GlobalVariable::CommonLinkage)
+    // common vars aren't constant even if declared const.
+    GV->setConstant(false);
+
+  SetCommonAttributes(D, GV);
+
+  // Emit global variable debug information.
+  if (CGDebugInfo *DI = getDebugInfo()) {
+    DI->setLocation(D->getLocation());
+    DI->EmitGlobalVariable(GV, D);
+  }
+}
+
+llvm::GlobalValue::LinkageTypes
+CodeGenModule::GetLLVMLinkageVarDefinition(const VarDecl *D,
+                                           llvm::GlobalVariable *GV) {
   GVALinkage Linkage = getContext().GetGVALinkageForVariable(D);
   if (Linkage == GVA_Internal)
-    GV->setLinkage(llvm::Function::InternalLinkage);
+    return llvm::Function::InternalLinkage;
   else if (D->hasAttr<DLLImportAttr>())
-    GV->setLinkage(llvm::Function::DLLImportLinkage);
+    return llvm::Function::DLLImportLinkage;
   else if (D->hasAttr<DLLExportAttr>())
-    GV->setLinkage(llvm::Function::DLLExportLinkage);
+    return llvm::Function::DLLExportLinkage;
   else if (D->hasAttr<WeakAttr>()) {
     if (GV->isConstant())
-      GV->setLinkage(llvm::GlobalVariable::WeakODRLinkage);
+      return llvm::GlobalVariable::WeakODRLinkage;
     else
-      GV->setLinkage(llvm::GlobalVariable::WeakAnyLinkage);
+      return llvm::GlobalVariable::WeakAnyLinkage;
   } else if (Linkage == GVA_TemplateInstantiation ||
              Linkage == GVA_ExplicitTemplateInstantiation)
     // FIXME: It seems like we can provide more specific linkage here
     // (LinkOnceODR, WeakODR).
-    GV->setLinkage(llvm::GlobalVariable::WeakAnyLinkage);   
+    return llvm::GlobalVariable::WeakAnyLinkage;
   else if (!getLangOptions().CPlusPlus && !CodeGenOpts.NoCommon &&
            !D->hasExternalStorage() && !D->getInit() &&
            !D->getAttr<SectionAttr>() && !D->isThreadSpecified()) {
     // Thread local vars aren't considered common linkage.
-    GV->setLinkage(llvm::GlobalVariable::CommonLinkage);
-    // common vars aren't constant even if declared const.
-    GV->setConstant(false);
-  } else
-    GV->setLinkage(llvm::GlobalVariable::ExternalLinkage);
-
-  SetCommonAttributes(D, GV);
-
-  // Emit global variable debug information.
-  if (CGDebugInfo *DI = getDebugInfo()) {
-    DI->setLocation(D->getLocation());
-    DI->EmitGlobalVariable(GV, D);
+    return llvm::GlobalVariable::CommonLinkage;
   }
+  return llvm::GlobalVariable::ExternalLinkage;
 }
 
 /// ReplaceUsesOfNonProtoTypeWithRealFunction - This function is called when we