Devirtualize Decl::getCanonicalDecl().

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@125735 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 23 insertions, 0 deletions

diff --git a/lib/AST/DeclBase.cpp b/lib/AST/DeclBase.cpp
index dfc5a6ae5d..d8b7c9b5b0 100644
--- a/lib/AST/DeclBase.cpp
+++ b/lib/AST/DeclBase.cpp
@@ -143,6 +143,29 @@ bool Decl::isDefinedOutsideFunctionOrMethod() const {
   return true;
 }
 
+namespace {
+  template<typename Class, typename Result>
+  inline Result *getSpecificCanonicalDecl(Decl *D, Result *(Class::*Get)()) {
+    return (llvm::cast<Class>(D)->*Get)();
+  }
+  
+  inline Decl *getSpecificCanonicalDecl(Decl *D, Decl *(Decl::*)()) {
+    // No specific implementation.
+    return D;
+  }
+}
+
+Decl *Decl::getCanonicalDecl() {
+  switch (getKind()) {
+#define ABSTRACT_DECL(Type)
+#define DECL(Type, Base) \
+    case Type:           \
+      return getSpecificCanonicalDecl(this, &Type##Decl::getCanonicalDecl);
+#include "clang/AST/DeclNodes.inc"
+  }
+  return this;
+  
+}
 
 //===----------------------------------------------------------------------===//
 // PrettyStackTraceDecl Implementation