Introduce the GlobalSelector class in the Indexing library.

GlobalSelector is an ASTContext-independent way to refer to Objective C selectors.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@77538 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 96 insertions, 0 deletions

diff --git a/include/clang/Index/GlobalSelector.h b/include/clang/Index/GlobalSelector.h
new file mode 100644
index 0000000000..7bbd303262
--- /dev/null
+++ b/include/clang/Index/GlobalSelector.h
@@ -0,0 +1,95 @@
+//===--- GlobalSelector.h - Cross-translation-unit "token" for selectors --===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  GlobalSelector is a ASTContext-independent way to refer to selectors.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_INDEX_GLOBALSELECTOR_H
+#define LLVM_CLANG_INDEX_GLOBALSELECTOR_H
+
+#include "llvm/ADT/DenseMap.h"
+#include <string>
+
+namespace clang {
+  class ASTContext;
+  class Selector;
+
+namespace idx {
+  class Program;
+
+/// \brief A ASTContext-independent way to refer to selectors.
+class GlobalSelector {
+  void *Val;
+
+  explicit GlobalSelector(void *val) : Val(val) { }
+
+public:
+  GlobalSelector() : Val(0) { }
+
+  /// \brief Get the ASTContext-specific selector.
+  Selector getSelector(ASTContext &AST) const;
+
+  bool isValid() const { return Val != 0; }
+  bool isInvalid() const { return !isValid(); }
+
+  /// \brief Get a printable name for debugging purpose.
+  std::string getPrintableName() const;
+
+  /// \brief Get a GlobalSelector for the ASTContext-specific selector.
+  static GlobalSelector get(Selector Sel, Program &Prog);
+  
+  void *getAsOpaquePtr() const { return Val; }
+
+  friend bool operator==(const GlobalSelector &LHS, const GlobalSelector &RHS) { 
+    return LHS.getAsOpaquePtr() == RHS.getAsOpaquePtr();
+  }
+  
+  // For use in a std::map.
+  friend bool operator< (const GlobalSelector &LHS, const GlobalSelector &RHS) { 
+    return LHS.getAsOpaquePtr() < RHS.getAsOpaquePtr();
+  }
+
+  // For use in DenseMap/DenseSet.
+  static GlobalSelector getEmptyMarker() { return GlobalSelector((void*)-1); }
+  static GlobalSelector getTombstoneMarker() {
+    return GlobalSelector((void*)-2);
+  }
+};
+  
+} // namespace idx
+
+} // namespace clang
+
+namespace llvm {
+/// Define DenseMapInfo so that GlobalSelectors can be used as keys in DenseMap
+/// and DenseSets.
+template<>
+struct DenseMapInfo<clang::idx::GlobalSelector> {
+  static inline clang::idx::GlobalSelector getEmptyKey() {
+    return clang::idx::GlobalSelector::getEmptyMarker();
+  }
+
+  static inline clang::idx::GlobalSelector getTombstoneKey() {
+    return clang::idx::GlobalSelector::getTombstoneMarker();
+  }
+
+  static unsigned getHashValue(clang::idx::GlobalSelector);
+
+  static inline bool 
+  isEqual(clang::idx::GlobalSelector LHS, clang::idx::GlobalSelector RHS) {
+    return LHS == RHS;
+  }
+
+  static inline bool isPod() { return true; }
+};
+
+}  // end namespace llvm
+
+#endif
diff --git a/include/clang/Index/Program.h b/include/clang/Index/Program.h
index b2bdaa6c2e..a9e0b878d7 100644
--- a/include/clang/Index/Program.h
+++ b/include/clang/Index/Program.h
@@ -28,6 +28,7 @@ class Program {
   Program(const Program&); // do not implement
   Program &operator=(const Program &); // do not implement
   friend class Entity;
+  friend class GlobalSelector;
   
 public:
   Program();