Introduce the ASTUnit class.

ASTUnit is a helper class to allow easy loading of an ASTContext from a PCH file. No users for now.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@73819 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 62 insertions, 0 deletions

diff --git a/include/clang/Frontend/ASTUnit.h b/include/clang/Frontend/ASTUnit.h
new file mode 100644
index 0000000000..1cbe2e2e27
--- /dev/null
+++ b/include/clang/Frontend/ASTUnit.h
@@ -0,0 +1,62 @@
+#ifndef LLVM_CLANG_FRONTEND_ASTUNIT_H
+#define LLVM_CLANG_FRONTEND_ASTUNIT_H
+
+#include "llvm/ADT/OwningPtr.h"
+#include <string>
+
+namespace clang {
+  class FileManager;
+  class FileEntry;
+  class SourceManager;
+  class DiagnosticClient;
+  class Diagnostic;
+  class HeaderSearch;
+  class TargetInfo;
+  class Preprocessor;
+  class ASTContext;
+  class Decl;
+
+/// \brief Utility class for loading a ASTContext from a PCH file.
+///
+class ASTUnit {
+  llvm::OwningPtr<SourceManager>    SourceMgr;
+  llvm::OwningPtr<DiagnosticClient> DiagClient;
+  llvm::OwningPtr<Diagnostic>       Diags;
+  llvm::OwningPtr<HeaderSearch>     HeaderInfo;
+  llvm::OwningPtr<TargetInfo>       Target;
+  llvm::OwningPtr<Preprocessor>     PP;
+  llvm::OwningPtr<ASTContext>       Ctx;
+
+  ASTUnit(const ASTUnit&); // do not implement
+  ASTUnit &operator=(const ASTUnit &); // do not implement
+  ASTUnit();
+  
+public:
+  ~ASTUnit();
+
+  const SourceManager &getSourceManager() const { return *SourceMgr.get(); }
+        SourceManager &getSourceManager()       { return *SourceMgr.get(); }
+
+  const Preprocessor &getPreprocessor() const { return *PP.get(); }
+        Preprocessor &getPreprocessor()       { return *PP.get(); }
+              
+  const ASTContext &getASTContext() const { return *Ctx.get(); }
+        ASTContext &getASTContext()       { return *Ctx.get(); }
+
+  /// \brief Create a ASTUnit from a PCH file.
+  ///
+  /// \param Filename PCH filename
+  ///
+  /// \param FileMgr The FileManager to use
+  ///
+  /// \param ErrMsg Error message to report if the PCH file could not be loaded
+  ///
+  /// \returns the initialized ASTUnit or NULL if the PCH failed to load
+  static ASTUnit *LoadFromPCHFile(const std::string &Filename,
+                                  FileManager &FileMgr,
+                                  std::string *ErrMsg = 0);
+};
+
+} // namespace clang
+
+#endif