Move 3 helper function to Linkage.h

This removes a duplicate from Decl.cpp and a followup patch will use
isExternallyVisible.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@182735 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 16 insertions, 0 deletions

diff --git a/include/clang/Basic/Linkage.h b/include/clang/Basic/Linkage.h
index 7f9ce6a909..699620784e 100644
--- a/include/clang/Basic/Linkage.h
+++ b/include/clang/Basic/Linkage.h
@@ -66,6 +66,22 @@ enum GVALinkage {
   GVA_ExplicitTemplateInstantiation
 };
 
+inline bool isExternallyVisible(Linkage L) {
+  return L == ExternalLinkage || L == VisibleNoLinkage;
+}
+
+inline Linkage getFormalLinkage(Linkage L) {
+  if (L == UniqueExternalLinkage)
+    return ExternalLinkage;
+  if (L == VisibleNoLinkage)
+    return NoLinkage;
+  return L;
+}
+
+inline bool isExternalFormalLinkage(Linkage L) {
+  return getFormalLinkage(L) == ExternalLinkage;
+}
+
 /// \brief Compute the minimum linkage given two linkages.
 ///
 /// The linkage can be interpreted as a pair formed by the formal linkage and