fixed files switching

dvm/fdvm/trunk/Sage/Sage++/libSage++.cpp

@@ -25,6 +25,8 @@ extern "C" void exit(int status);
 
 #include "extcxx_low.h"
 extern "C" int number_of_ll_node;
+extern "C" PTR_SYMB last_file_symbol;
+extern "C" PTR_SYMB FileLastSymbol(...);
 
 #undef USER
 
@@ -1641,9 +1643,11 @@ SgFile &SgProject::file(int i)
 
     current_file_id = i;
     current_file = pt;
+    
 #ifdef __SPF   
     SgStatement::setCurrProcessFile(pt->filename());
     SgStatement::setCurrProcessLine(0);
+    last_file_symbol = FileLastSymbol(pt->filename());
 #endif
     return *pt;
 }
@@ -1777,6 +1781,7 @@ int SgFile::switchToFile(const std::string &name)
         }
     }
 
+    last_file_symbol = FileLastSymbol(name.c_str());
     return it->second.second;
 }