Add line map statistics to -fmem-report output

This patch adds statistics about line maps' memory consumption and
macro expansion to the output of -fmem-report.  It has been useful in
trying to reduce the memory consumption of the macro maps support.

Co-Authored-By: Dodji Seketeli <dodji@redhat.com>

From-SVN: r180085

1 files changed, 21 insertions, 0 deletions

diff --git a/libcpp/include/line-map.h b/libcpp/include/line-map.h
index 04a523c..572e330 100644
--- a/libcpp/include/line-map.h
+++ b/libcpp/include/line-map.h
@@ -675,6 +675,27 @@ expanded_location linemap_expand_location_full (struct line_maps *,
 						source_location loc,
 						enum location_resolution_kind lrk);
 
+/* Statistics about maps allocation and usage as returned by
+   linemap_get_statistics.  */
+struct linemap_stats
+{
+  size_t num_ordinary_maps_allocated;
+  size_t num_ordinary_maps_used;
+  size_t ordinary_maps_allocated_size;
+  size_t ordinary_maps_used_size;
+  size_t num_expanded_macros;
+  size_t num_macro_tokens;
+  size_t num_macro_maps_used;
+  size_t macro_maps_allocated_size;
+  size_t macro_maps_used_size;
+  size_t macro_maps_locations_size;
+  size_t duplicated_macro_maps_locations_size;
+};
+
+/* Compute and return statistics about the memory consumption of some
+   parts of the line table SET.  */
+void linemap_get_statistics (struct line_maps *, struct linemap_stats *);
+
 /* Dump debugging information about source location LOC into the file
    stream STREAM. SET is the line map set LOC comes from.  */
 void linemap_dump_location (struct line_maps *, source_location, FILE *);