Move the functionality of ASTContext::getCanonicalDecl(), into a virtual method Decl::getCanonicalDecl().

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@76273 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 18 insertions, 4 deletions

diff --git a/lib/AST/Decl.cpp b/lib/AST/Decl.cpp
index 728724f1b3..0a6f28d3fb 100644
--- a/lib/AST/Decl.cpp
+++ b/lib/AST/Decl.cpp
@@ -387,8 +387,11 @@ VarDecl *VarDecl::getFirstDeclaration() {
   return First;
 }
 
-Decl *VarDecl::getPrimaryDecl() const {
-  return const_cast<VarDecl *>(getFirstDeclaration());
+VarDecl *VarDecl::getCanonicalDecl() {
+  VarDecl *Var = this;
+  while (Var->getPreviousDeclaration())
+    Var = Var->getPreviousDeclaration();
+  return Var;
 }
 
 //===----------------------------------------------------------------------===//
@@ -621,8 +624,11 @@ FunctionDecl *FunctionDecl::getFirstDeclaration() {
   return First;
 }
 
-Decl *FunctionDecl::getPrimaryDecl() const {
-  return const_cast<FunctionDecl *>(getFirstDeclaration());
+FunctionDecl *FunctionDecl::getCanonicalDecl() {
+  FunctionDecl *FD = this;
+  while (FD->getPreviousDeclaration())
+    FD = FD->getPreviousDeclaration();
+  return FD;
 }
 
 /// getOverloadedOperator - Which C++ overloaded operator this
@@ -703,6 +709,14 @@ SourceRange TagDecl::getSourceRange() const {
   return SourceRange(getLocation(), E);
 }
 
+TagDecl* TagDecl::getCanonicalDecl() {
+  Type *T = getTypeForDecl();
+  if (T == 0)
+    T = getASTContext().getTagDeclType(this).getTypePtr();
+
+  return cast<TagDecl>(cast<TagType>(T->getCanonicalTypeInternal())->getDecl());
+}
+
 void TagDecl::startDefinition() {
   TagType *TagT = const_cast<TagType *>(TypeForDecl->getAsTagType());
   TagT->decl.setPointer(this);