Insert interception point onStartOfTranslationUnit.

Often users of the ASTMatchers want to add tasks that are done once per
translation unit, for example, cleaning up caches. Combined with the
interception point for the end of source file one can add to the factory
creation, this covers the cases we've seen users need.

llvm-svn: 167271

1 files changed, 10 insertions, 0 deletions

diff --git a/clang/lib/ASTMatchers/ASTMatchFinder.cpp b/clang/lib/ASTMatchers/ASTMatchFinder.cpp
index b081f5426ea..8ecb26e8c19 100644
--- a/clang/lib/ASTMatchers/ASTMatchFinder.cpp
+++ b/clang/lib/ASTMatchers/ASTMatchFinder.cpp
@@ -315,6 +315,15 @@ public:
        ActiveASTContext(NULL) {
   }
 
+  void onStartOfTranslationUnit() {
+    for (std::vector<std::pair<const internal::DynTypedMatcher*,
+                               MatchCallback*> >::const_iterator
+             I = MatcherCallbackPairs->begin(), E = MatcherCallbackPairs->end();
+         I != E; ++I) {
+      I->second->onStartOfTranslationUnit();
+    }
+  }
+
   void set_active_ast_context(ASTContext *NewActiveASTContext) {
     ActiveASTContext = NewActiveASTContext;
   }
@@ -649,6 +658,7 @@ private:
       ParsingDone->run();
     }
     Visitor.set_active_ast_context(&Context);
+    Visitor.onStartOfTranslationUnit();
     Visitor.TraverseDecl(Context.getTranslationUnitDecl());
     Visitor.set_active_ast_context(NULL);
   }