dwarf: Fix cache size calculation

The and mask trick only works for power-of-two sized things,
but must be computed using the full size.  This incorrectly
resulted in a very small cache size.

Found using bisect and 'make perf' in tests directory.

blame rev: 0b51f5892df0691fc7b3b947647222ab8e57dd54

1 files changed, 5 insertions, 5 deletions

diff --git a/src/dwarf/Gparser.c b/src/dwarf/Gparser.c
index 8b5c1de2..25f2d2c6 100644
--- a/src/dwarf/Gparser.c
+++ b/src/dwarf/Gparser.c
@@ -679,7 +679,7 @@ rs_new (struct dwarf_rs_cache *cache, struct dwarf_cursor * c)
   unsigned short head;
 
   head = cache->rr_head;
-  cache->rr_head = (head + 1) & (cache->log_size - 1);
+  cache->rr_head = (head + 1) & (DWARF_UNW_CACHE_SIZE(cache->log_size) - 1);
 
   /* remove the old rs from the hash table (if it's there): */
   if (cache->links[head].ip)
@@ -885,7 +885,7 @@ find_reg_state (struct dwarf_cursor *c, dwarf_state_record_t *sr)
   int ret = 0;
   intrmask_t saved_mask;
 
-  if ((cache = get_rs_cache(c->as, &saved_mask)) && 
+  if ((cache = get_rs_cache(c->as, &saved_mask)) &&
       (rs = rs_lookup(cache, c)))
     {
       /* update hint; no locking needed: single-word writes are atomic */
@@ -951,7 +951,7 @@ dwarf_make_proc_info (struct dwarf_cursor *c)
      needed for unw_resume */
   dwarf_state_record_t sr;
   int ret;
-  
+
   /* Lookup it up the slow way... */
   ret = fetch_proc_info (c, c->ip, 0);
   if (ret >= 0)
@@ -1018,11 +1018,11 @@ dwarf_reg_states_iterate(struct dwarf_cursor *c,
       case UNW_INFO_FORMAT_REMOTE_TABLE:
 	ret = dwarf_reg_states_table_iterate(c, cb, token);
 	break;
-	  
+
       case UNW_INFO_FORMAT_DYNAMIC:
 	ret = dwarf_reg_states_dynamic_iterate (c, cb, token);
 	break;
-	  
+
       default:
 	Debug (1, "Unexpected unwind-info format %d\n", c->pi.format);
 	ret = -UNW_EINVAL;