+{
+ struct file_stack *next;
+ location_t location;
+};
+
+/* Top-level source file. */
+extern const char *main_input_filename;
+
+extern location_t input_location;
+#ifdef USE_MAPPED_LOCATION
+extern void push_srcloc (location_t);
+#else /* ! USE_MAPPED_LOCATION */
+extern void push_srcloc (const char *name, int line);
+#endif /* ! USE_MAPPED_LOCATION */
+extern void pop_srcloc (void);
+
+#define LOCATION_FILE(LOC) ((expand_location (LOC)).file)
+#define LOCATION_LINE(LOC) ((expand_location (LOC)).line)
+
+#define input_line LOCATION_LINE(input_location)
+#define input_filename LOCATION_FILE(input_location)