Make sure to free the explicit template arguments provided for an

explicit instantiation. Also, tighten up reference-count checking to
help catch these issues earlier. Fixes PR5069.

llvm-svn: 83225

clang/include/clang/AST/Stmt.h

@@ -188,7 +188,10 @@ public:
     return this;
   }
 
-  StmtClass getStmtClass() const { return (StmtClass)sClass; }
+  StmtClass getStmtClass() const { 
+    assert(RefCount >= 1 && "Referencing already-destroyed statement!");
+    return (StmtClass)sClass; 
+  }
   const char *getStmtClassName() const;
 
   /// SourceLocation tokens are not useful in isolation - they are low level

clang/lib/Sema/SemaTemplate.cpp

@@ -3414,6 +3414,7 @@ Sema::DeclResult Sema::ActOnExplicitInstantiation(Scope *S,
                                TemplateId->getTemplateArgLocations(),
                                TemplateArgs);
     HasExplicitTemplateArgs = true;
+    TemplateArgsPtr.release();
   }
     
   // C++ [temp.explicit]p1:

clang/test/SemaTemplate/explicit-instantiation.cpp

@@ -69,3 +69,7 @@ template void print_type<int>(float*); // expected-error{{does not refer}}
 
 void print_type(double*);
 template void print_type<double>(double*);
+
+// PR5069
+template<int I> void foo0 (int (&)[I + 1]) { }
+template void foo0<2> (int (&)[3]);