[GCC] Attribute ifunc support in clang

This patch add support for GCC attribute((ifunc("resolver"))) for
targets that use ELF as object file format. In general ifunc is a
special kind of function alias with type @gnu_indirect_function. LLVM
patch http://reviews.llvm.org/D15525

Differential Revision: http://reviews.llvm.org/D15524

llvm-svn: 265917

1 files changed, 12 insertions, 0 deletions

diff --git a/clang/lib/AST/DeclBase.cpp b/clang/lib/AST/DeclBase.cpp
index 2722b82ef12..57149af3c10 100644
--- a/clang/lib/AST/DeclBase.cpp
+++ b/clang/lib/AST/DeclBase.cpp
@@ -362,6 +362,18 @@ bool Decl::isReferenced() const {
   return false; 
 }
 
+bool Decl::hasDefiningAttr() const {
+  return hasAttr<AliasAttr>() || hasAttr<IFuncAttr>();
+}
+
+const Attr *Decl::getDefiningAttr() const {
+  if (AliasAttr *AA = getAttr<AliasAttr>())
+    return AA;
+  if (IFuncAttr *IFA = getAttr<IFuncAttr>())
+    return IFA;
+  return nullptr;
+}
+
 /// \brief Determine the availability of the given declaration based on
 /// the target platform.
 ///