unsigned int used;
};
-/* Reason for adding a line change with add_line_map (). */
+/* Reason for adding a line change with add_line_map (). LC_ENTER is
+ when including a new file, e.g. a #include directive in C.
+ LC_LEAVE is when reaching a file's end. LC_RENAME is when a file
+ name or line number changes for neither of the above reasons
+ (e.g. a #line directive in C). */
enum lc_reason {LC_ENTER = 0, LC_LEAVE, LC_RENAME};
/* Initialize a line map set. */
PARAMS ((struct line_maps *));
/* Add a mapping of logical source line to physical source file and
- line number. Ther text pointed to by TO_FILE must have a lifetime
+ line number. The text pointed to by TO_FILE must have a lifetime
at least as long as the final call to lookup_line ().
FROM_LINE should be monotonic increasing across calls to this
/* Non-zero if the map is at the bottom of the include stack. */
#define MAIN_FILE_P(MAP) ((MAP)->included_from < 0)
-/* The current line map. */
+/* The current line map. Saves a call to lookup_line if the caller is
+ sure he is in the scope of the current map. */
#define CURRENT_LINE_MAP(MAPS) ((MAPS)->maps + (MAPS)->used - 1)
#endif /* !GCC_LINE_MAP_H */
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