X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fruntime%2Fgencgc-internal.h;h=9ff5a19c14aef971a0ea88541d131fd26ec372f9;hb=8bc4923b67afbaed8914200cbabc948d9b5eaece;hp=eaa789849a3b24ca7e48959b95a070d9751c19fd;hpb=b85552a9ed94019afd70b11b069f3c9b0afdaaa8;p=sbcl.git

diff --git a/src/runtime/gencgc-internal.h b/src/runtime/gencgc-internal.h
index eaa7898..9ff5a19 100644
--- a/src/runtime/gencgc-internal.h
+++ b/src/runtime/gencgc-internal.h
@@ -72,9 +72,10 @@ struct page {
      * hard to achieve). */
     int  bytes_used;
 
-    /* It is important to know the offset to the first object in the
-     * page. Currently it's only important to know if an object starts
-     * at the beginning of the page in which case the offset would be 0. */
+    /* The name of this field is not well-chosen for its actual use.
+     * This is the offset from the start of the page to the start 
+     * of the alloc_region which contains/contained it.  It's negative or 0
+     */
     int  first_object_offset;
 };
 
@@ -83,6 +84,7 @@ struct page {
 
 /* the number of pages needed for the dynamic space - rounding up */
 #define NUM_PAGES ((DYNAMIC_SPACE_SIZE+PAGE_BYTES-1)/PAGE_BYTES)
+
 extern struct page page_table[NUM_PAGES];