Change the semantics for Entity.

Entity can now refer to declarations that are not visible outside the translation unit.
It is a wrapper of a pointer union, it's either a Decl* for declarations that don't
"cross" translation units, or an EntityImpl* which is associated with the specific "visible" Decl.

Included is a test case for handling fields across translation units.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@76515 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 63 insertions, 0 deletions

diff --git a/lib/Index/EntityImpl.h b/lib/Index/EntityImpl.h
new file mode 100644
index 0000000000..334dcfb4ec
--- /dev/null
+++ b/lib/Index/EntityImpl.h
@@ -0,0 +1,63 @@
+//===--- EntityImpl.h - Internal Entity implementation---------*- C++ -*-=====//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  Internal implementation for the Entity class
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_INDEX_ENTITYIMPL_H
+#define LLVM_CLANG_INDEX_ENTITYIMPL_H
+
+#include "clang/Index/Entity.h"
+#include "llvm/ADT/FoldingSet.h"
+#include "llvm/ADT/StringSet.h"
+
+namespace clang {
+
+namespace idx {
+  class ProgramImpl;
+
+class EntityImpl : public llvm::FoldingSetNode {
+public:
+  typedef llvm::StringMapEntry<char> IdEntryTy;
+
+private:
+  Entity Parent;
+  IdEntryTy *Id;
+
+  /// \brief Identifier namespace.
+  unsigned IdNS;
+
+public:
+  EntityImpl(Entity parent, IdEntryTy *id, unsigned idNS)
+    : Parent(parent), Id(id), IdNS(idNS) { }
+
+  /// \brief Find the Decl that can be referred to by this entity.
+  Decl *getDecl(ASTContext &AST);
+
+  /// \brief Get an Entity associated with the given Decl.
+  /// \returns Null if an Entity cannot refer to this Decl.
+  static Entity get(Decl *D, ProgramImpl &Prog);
+
+  void Profile(llvm::FoldingSetNodeID &ID) const {
+    Profile(ID, Parent, Id, IdNS);
+  }
+  static void Profile(llvm::FoldingSetNodeID &ID, Entity Parent, IdEntryTy *Id,
+                      unsigned IdNS) {
+    ID.AddPointer(Parent.getAsOpaquePtr());
+    ID.AddPointer(Id);
+    ID.AddInteger(IdNS);
+  }
+};
+
+} // namespace idx
+
+} // namespace clang
+
+#endif