add actions for deleting expr/stmt nodes.

llvm-svn: 41635

clang/Sema/Sema.cpp

@@ -38,6 +38,13 @@ Sema::Sema(Preprocessor &pp, ASTContext &ctxt, std::vector<Decl*> &prevInGroup)
   KnownFunctionIDs[ id_vprintf ] = &IT.get("vprintf");
 }
 
+void Sema::DeleteExpr(ExprTy *E) {
+  delete static_cast<Expr*>(E);
+}
+void Sema::DeleteStmt(StmtTy *S) {
+  delete static_cast<Stmt*>(S);
+}
+
 //===----------------------------------------------------------------------===//
 // Helper functions.
 //===----------------------------------------------------------------------===//

clang/Sema/Sema.h

@@ -120,6 +120,9 @@ public:
             const std::string &Msg1, const std::string &Msg2, 
             SourceRange R1, SourceRange R2);
 
+  virtual void DeleteExpr(ExprTy *E);
+  virtual void DeleteStmt(StmtTy *S);
+
   //===--------------------------------------------------------------------===//
   // Type Analysis / Processing: SemaType.cpp.
   //

clang/include/clang/Parse/Action.h

@@ -78,6 +78,12 @@ public:
   typedef ActionResult<1> StmtResult;
   typedef ActionResult<2> TypeResult;
   
+  /// Deletion callbacks - Since the parser doesn't know the concrete types of
+  /// the AST nodes being generated, it must do callbacks to delete objects when
+  /// recovering from errors.
+  virtual void DeleteExpr(ExprTy *E) {}
+  virtual void DeleteStmt(StmtTy *E) {}
+  
   //===--------------------------------------------------------------------===//
   // Declaration Tracking Callbacks.
   //===--------------------------------------------------------------------===//