v4 preprocessor: fixed memory management error

git-svn-id: https://www.dynare.org/svn/dynare/dynare_v4@1723 ac1d8469-bf42-47a9-8791-bf33cf982152

DynareBison.yy

@@ -53,6 +53,11 @@ class ParsingDriver;
 %lex-param { ParsingDriver &driver }
 
 %locations
+%initial-action
+{
+  // Initialize the location filenames to NULL
+  @$.begin.filename = @$.end.filename = NULL;
+}
 
 %debug
 %error-verbose

DynareFlex.ll

@@ -401,6 +401,12 @@ int sigma_e = 0;
  /* Add the native statement */
 <NATIVE>.* { driver.add_native(yytext); BEGIN INITIAL; }
 
+<*><<EOF>> {
+             if (yylloc->begin.filename)
+               delete yylloc->begin.filename;
+             yyterminate();
+           }
+
 <*>.      { driver.error(*yylloc, "character unrecognized by lexer"); }
 %%
 

ParsingDriver.cc

@@ -75,9 +75,6 @@ ParsingDriver::parse(istream &in)
   Dynare::parser parser(*this);
   parser.parse();
 
-  if (location.begin.filename)
-    delete location.begin.filename;
-
   delete lexer;
   delete tmp_symbol_table;