X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcode%2Fhash-table.lisp;h=22740e516dbd8b69d4e2d82f29b8a9aec372b625;hb=d10b036b1d20e6cff820f72b69af2a06dc362327;hp=1811acfe0d15af8ec14f2e4f5a6b8a6ddf269b2f;hpb=54e97796e29cb89892dd30c8cb8c5e9d0a870f94;p=sbcl.git

diff --git a/src/code/hash-table.lisp b/src/code/hash-table.lisp
index 1811acf..22740e5 100644
--- a/src/code/hash-table.lisp
+++ b/src/code/hash-table.lisp
@@ -39,11 +39,13 @@
   (number-entries 0 :type index)
   ;; The Key-Value pair vector.
   (table (missing-arg) :type simple-vector)
-  ;; True if this is a weak hash table, meaning that key->value
-  ;; mappings will disappear if there are no other references to the
-  ;; key. Note: this only matters if the hash function indicates that
-  ;; the hashing is EQ based.
-  (weak-p nil :type (member t nil))
+  ;; This slot is used to link weak hash tables during GC. When the GC
+  ;; isn't running it is always NIL.
+  (next-weak-hash-table nil :type null)
+  ;; Non-NIL if this is some kind of weak hash table. For details see
+  ;; the docstring of MAKE-HASH-TABLE.
+  (weakness nil :type (member nil :key :value :key-or-value :key-and-value)
+            :read-only t)
   ;; Index into the next-vector, chaining together buckets that need
   ;; to be rehashed because their hashing is EQ based and the key has
   ;; been moved by the garbage collector.
@@ -86,17 +88,20 @@
 (defmacro-mundanely with-hash-table-iterator ((function hash-table) &body body)
   #!+sb-doc
   "WITH-HASH-TABLE-ITERATOR ((function hash-table) &body body)
-   provides a method of manually looping over the elements of a hash-table.
-   FUNCTION is bound to a generator-macro that, within the scope of the
-   invocation, returns one or three values. The first value tells whether
-   any objects remain in the hash table. When the first value is non-NIL,
-   the second and third values are the key and the value of the next object."
+
+Provides a method of manually looping over the elements of a hash-table.
+FUNCTION is bound to a generator-macro that, within the scope of the
+invocation, returns one or three values. The first value tells whether any
+objects remain in the hash table. When the first value is non-NIL, the second
+and third values are the key and the value of the next object."
+  ;; This essentially duplicates MAPHASH, so any changes here should
+  ;; be reflected there as well.
   (let ((n-function (gensym "WITH-HASH-TABLE-ITERATOR-")))
     `(let ((,n-function
             (let* ((table ,hash-table)
                    (length (length (hash-table-next-vector table)))
                    (index 1))
-              (declare (type (mod #.(floor most-positive-fixnum 2)) index))
+              (declare (type index/2 index))
               (labels
                   ((,function ()
                      ;; (We grab the table again on each iteration just in