From 180abc3db9ae3b4fc63cd65b15697e6ffcc8a657 Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Sun, 17 Jul 2011 15:40:56 +0000
Subject: Vendor import of clang trunk r135360:
 http://llvm.org/svn/llvm-project/cfe/trunk@135360

---
 include/clang/Frontend/FrontendAction.h | 39 +++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

(limited to 'include/clang/Frontend/FrontendAction.h')

diff --git a/include/clang/Frontend/FrontendAction.h b/include/clang/Frontend/FrontendAction.h
index ee0863a4776f..f335475665fd 100644
--- a/include/clang/Frontend/FrontendAction.h
+++ b/include/clang/Frontend/FrontendAction.h
@@ -51,6 +51,7 @@ class FrontendAction {
   llvm::OwningPtr<ASTUnit> CurrentASTUnit;
   CompilerInstance *Instance;
   friend class ASTMergeAction;
+  friend class WrapperFrontendAction;
 
 private:
   ASTConsumer* CreateWrappedASTConsumer(CompilerInstance &CI,
@@ -77,6 +78,14 @@ protected:
   virtual ASTConsumer *CreateASTConsumer(CompilerInstance &CI,
                                          llvm::StringRef InFile) = 0;
 
+  /// \brief Callback before starting processing a single input, giving the
+  /// opportunity to modify the CompilerInvocation or do some other action
+  /// before BeginSourceFileAction is called.
+  ///
+  /// \return True on success; on failure \see BeginSourceFileAction() and
+  /// ExecutionAction() and EndSourceFileAction() will not be called.
+  virtual bool BeginInvocation(CompilerInstance &CI) { return true; }
+
   /// BeginSourceFileAction - Callback at the start of processing a single
   /// input.
   ///
@@ -253,6 +262,36 @@ public:
   virtual bool usesPreprocessorOnly() const { return true; }
 };
 
+/// WrapperFrontendAction - A frontend action which simply wraps some other
+/// runtime specified frontend action. Deriving from this class allows an
+/// action to inject custom logic around some existing action's behavior. It
+/// implements every virtual method in the FrontendAction interface by
+/// forwarding to the wrapped action.
+class WrapperFrontendAction : public FrontendAction {
+  llvm::OwningPtr<FrontendAction> WrappedAction;
+
+protected:
+  virtual ASTConsumer *CreateASTConsumer(CompilerInstance &CI,
+                                         llvm::StringRef InFile);
+  virtual bool BeginInvocation(CompilerInstance &CI);
+  virtual bool BeginSourceFileAction(CompilerInstance &CI,
+                                     llvm::StringRef Filename);
+  virtual void ExecuteAction();
+  virtual void EndSourceFileAction();
+
+public:
+  /// Construct a WrapperFrontendAction from an existing action, taking
+  /// ownership of it.
+  WrapperFrontendAction(FrontendAction *WrappedAction);
+
+  virtual bool usesPreprocessorOnly() const;
+  virtual bool usesCompleteTranslationUnit();
+  virtual bool hasPCHSupport() const;
+  virtual bool hasASTFileSupport() const;
+  virtual bool hasIRSupport() const;
+  virtual bool hasCodeCompletionSupport() const;
+};
+
 }  // end namespace clang
 
 #endif
-- 
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