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diff --git a/clang/tools/libclang/CIndexDiagnostic.h b/clang/tools/libclang/CIndexDiagnostic.h
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+++ b/clang/tools/libclang/CIndexDiagnostic.h
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+/*===-- CIndexDiagnostic.h - Diagnostics C Interface ------------*- C++ -*-===*\
+|*                                                                            *|
+|*                     The LLVM Compiler Infrastructure                       *|
+|*                                                                            *|
+|* This file is distributed under the University of Illinois Open Source      *|
+|* License. See LICENSE.TXT for details.                                      *|
+|*                                                                            *|
+|*===----------------------------------------------------------------------===*|
+|*                                                                            *|
+|* Implements the diagnostic functions of the Clang C interface.              *|
+|*                                                                            *|
+\*===----------------------------------------------------------------------===*/
+#ifndef LLVM_CLANG_CINDEX_DIAGNOSTIC_H
+#define LLVM_CLANG_CINDEX_DIAGNOSTIC_H
+
+#include "clang-c/Index.h"
+#include <vector>
+#include <assert.h>
+
+namespace clang {
+
+class LangOptions;
+class StoredDiagnostic;
+class CXDiagnosticImpl;
+  
+class CXDiagnosticSetImpl {
+  std::vector<CXDiagnosticImpl *> Diagnostics;
+  const bool IsExternallyManaged;
+public:
+  CXDiagnosticSetImpl(bool isManaged = false)
+    : IsExternallyManaged(isManaged) {}
+
+  virtual ~CXDiagnosticSetImpl();
+  
+  size_t getNumDiagnostics() const {
+    return Diagnostics.size();
+  }
+  
+  CXDiagnosticImpl *getDiagnostic(unsigned i) const {
+    assert(i < getNumDiagnostics());
+    return Diagnostics[i];
+  }
+  
+  void appendDiagnostic(CXDiagnosticImpl *D) {
+    Diagnostics.push_back(D);
+  }
+  
+  bool empty() const {
+    return Diagnostics.empty();
+  }
+  
+  bool isExternallyManaged() const { return IsExternallyManaged; }
+};
+
+class CXDiagnosticImpl {
+public:
+  enum Kind { StoredDiagnosticKind, LoadedDiagnosticKind,
+              CustomNoteDiagnosticKind };
+  
+  virtual ~CXDiagnosticImpl();
+  
+  /// \brief Return the severity of the diagnostic.
+  virtual CXDiagnosticSeverity getSeverity() const = 0;
+  
+  /// \brief Return the location of the diagnostic.
+  virtual CXSourceLocation getLocation() const = 0;
+
+  /// \brief Return the spelling of the diagnostic.
+  virtual CXString getSpelling() const = 0;
+
+  /// \brief Return the text for the diagnostic option.
+  virtual CXString getDiagnosticOption(CXString *Disable) const = 0;
+  
+  /// \brief Return the category of the diagnostic.
+  virtual unsigned getCategory() const = 0;
+
+  /// \brief Return the category string of the diagnostic.
+  virtual CXString getCategoryText() const = 0;
+
+  /// \brief Return the number of source ranges for the diagnostic.
+  virtual unsigned getNumRanges() const = 0;
+  
+  /// \brief Return the source ranges for the diagnostic.
+  virtual CXSourceRange getRange(unsigned Range) const = 0;
+
+  /// \brief Return the number of FixIts.
+  virtual unsigned getNumFixIts() const = 0;
+
+  /// \brief Return the FixIt information (source range and inserted text).
+  virtual CXString getFixIt(unsigned FixIt,
+                            CXSourceRange *ReplacementRange) const = 0;
+
+  Kind getKind() const { return K; }
+  
+  CXDiagnosticSetImpl &getChildDiagnostics() {
+    return ChildDiags;
+  }
+  
+protected:
+  CXDiagnosticImpl(Kind k) : K(k) {}
+  CXDiagnosticSetImpl ChildDiags;
+  
+  void append(CXDiagnosticImpl *D) {
+    ChildDiags.appendDiagnostic(D);
+  }
+  
+private:
+  Kind K;
+};
+  
+/// \brief The storage behind a CXDiagnostic
+struct CXStoredDiagnostic : public CXDiagnosticImpl {
+  const StoredDiagnostic &Diag;
+  const LangOptions &LangOpts;
+  
+  CXStoredDiagnostic(const StoredDiagnostic &Diag,
+                     const LangOptions &LangOpts)
+    : CXDiagnosticImpl(StoredDiagnosticKind),
+      Diag(Diag), LangOpts(LangOpts) { }
+  
+  virtual ~CXStoredDiagnostic() {}
+  
+  /// \brief Return the severity of the diagnostic.
+  virtual CXDiagnosticSeverity getSeverity() const;
+  
+  /// \brief Return the location of the diagnostic.
+  virtual CXSourceLocation getLocation() const;
+
+  /// \brief Return the spelling of the diagnostic.
+  virtual CXString getSpelling() const;
+
+  /// \brief Return the text for the diagnostic option.
+  virtual CXString getDiagnosticOption(CXString *Disable) const;
+  
+  /// \brief Return the category of the diagnostic.
+  virtual unsigned getCategory() const;
+  
+  /// \brief Return the category string of the diagnostic.
+  virtual CXString getCategoryText() const;
+
+  /// \brief Return the number of source ranges for the diagnostic.
+  virtual unsigned getNumRanges() const;
+  
+  /// \brief Return the source ranges for the diagnostic.
+  virtual CXSourceRange getRange(unsigned Range) const;
+
+  /// \brief Return the number of FixIts.
+  virtual unsigned getNumFixIts() const;
+
+  /// \brief Return the FixIt information (source range and inserted text).
+  virtual CXString getFixIt(unsigned FixIt,
+                            CXSourceRange *ReplacementRange) const;
+
+  static bool classof(const CXDiagnosticImpl *D) {
+    return D->getKind() == StoredDiagnosticKind;
+  }
+};
+
+namespace cxdiag {
+CXDiagnosticSetImpl *lazyCreateDiags(CXTranslationUnit TU,
+                                     bool checkIfChanged = false);
+} // end namespace cxdiag
+
+} // end namespace clang
+
+#endif // LLVM_CLANG_CINDEX_DIAGNOSTIC_H