diff options
Diffstat (limited to 'include/private/gc_hdrs.h')
| -rw-r--r-- | include/private/gc_hdrs.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/include/private/gc_hdrs.h b/include/private/gc_hdrs.h index 2f2d1bf9..60dc2ad3 100644 --- a/include/private/gc_hdrs.h +++ b/include/private/gc_hdrs.h @@ -49,14 +49,16 @@ typedef struct bi { hdr * index[BOTTOM_SZ]; /* * The bottom level index contains one of three kinds of values: - * 0 means we're not responsible for this block. + * 0 means we're not responsible for this block, + * or this is a block other than the first one in a free block. * 1 < (long)X <= MAX_JUMP means the block starts at least * X * HBLKSIZE bytes before the current address. * A valid pointer points to a hdr structure. (The above can't be * valid pointers due to the GET_MEM return convention.) */ struct bi * asc_link; /* All indices are linked in */ - /* ascending order. */ + /* ascending order... */ + struct bi * desc_link; /* ... and in descending order. */ word key; /* high order address bits. */ # ifdef HASH_TL struct bi * hash_link; /* Hash chain link. */ |