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Use ptrdiff_t instead of Lisp_Object for collision
* src/alloc.c (purecopy_hash_table): Assign, don’t purecopy. * src/fns.c (set_hash_next_slot, set_hash_index_slot): Hash index arg is now ptrdiff_t index (or -1 if empty), not Lisp_Object integer (or Qnil if empty). All callers changed. (larger_vecalloc): New static function. (larger_vector): Use it. (HASH_NEXT, HASH_INDEX): Move here from lisp.h. Return ptrdiff_t index (or -1) not Lisp_Object integer (or Qnil). All callers changed. * src/fns.c (make_hash_table, maybe_resize_hash_table, hash_lookup) (hash_put, hash_remove_from_table, hash_clear, sweep_weak_table): * src/profiler.c (evict_lower_half, record_backtrace): -1, not nil, is now the convention for end of collision list. * src/fns.c (maybe_resize_hash_table): Avoid double-initialization of the free list. Reallocate H->next last, in case other reallocations exhaust memory. * src/lisp.h (struct Lisp_Hash_Table): ‘next_free’ is now ptrdiff_t, not Lisp_Object. Adjust commentary for ‘next’ and ‘index’, which no longer contain nil. (HASH_NEXT, HASH_INDEX): Move to src/fns.c.
This commit is contained in:
Paul Eggert
parent
7207b63c8e
commit
5cbdaa98f9
4 changed files with 107 additions and 104 deletions
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@ -5459,7 +5459,7 @@ purecopy_hash_table (struct Lisp_Hash_Table *table)
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pure->rehash_size = purecopy (table->rehash_size);
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pure->hash = purecopy (table->hash);
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pure->next = purecopy (table->next);
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pure->next_free = purecopy (table->next_free);
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pure->next_free = table->next_free;
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pure->index = purecopy (table->index);
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pure->count = table->count;
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pure->pure = table->pure;
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171
src/fns.c
171
src/fns.c
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@ -3437,9 +3437,9 @@ set_hash_next (struct Lisp_Hash_Table *h, Lisp_Object next)
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h->next = next;
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}
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static void
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set_hash_next_slot (struct Lisp_Hash_Table *h, ptrdiff_t idx, Lisp_Object val)
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set_hash_next_slot (struct Lisp_Hash_Table *h, ptrdiff_t idx, ptrdiff_t val)
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{
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gc_aset (h->next, idx, val);
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gc_aset (h->next, idx, make_number (val));
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}
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static void
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set_hash_hash (struct Lisp_Hash_Table *h, Lisp_Object hash)
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@ -3457,9 +3457,9 @@ set_hash_index (struct Lisp_Hash_Table *h, Lisp_Object index)
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h->index = index;
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}
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static void
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set_hash_index_slot (struct Lisp_Hash_Table *h, ptrdiff_t idx, Lisp_Object val)
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set_hash_index_slot (struct Lisp_Hash_Table *h, ptrdiff_t idx, ptrdiff_t val)
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{
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gc_aset (h->index, idx, val);
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gc_aset (h->index, idx, make_number (val));
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}
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/* If OBJ is a Lisp hash table, return a pointer to its struct
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@ -3513,11 +3513,11 @@ get_key_arg (Lisp_Object key, ptrdiff_t nargs, Lisp_Object *args, char *used)
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/* Return a Lisp vector which has the same contents as VEC but has
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at least INCR_MIN more entries, where INCR_MIN is positive.
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If NITEMS_MAX is not -1, do not grow the vector to be any larger
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than NITEMS_MAX. Entries in the resulting
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vector that are not copied from VEC are set to nil. */
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than NITEMS_MAX. New entries in the resulting vector are
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uninitialized. */
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Lisp_Object
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larger_vector (Lisp_Object vec, ptrdiff_t incr_min, ptrdiff_t nitems_max)
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static Lisp_Object
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larger_vecalloc (Lisp_Object vec, ptrdiff_t incr_min, ptrdiff_t nitems_max)
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{
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struct Lisp_Vector *v;
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ptrdiff_t incr, incr_max, old_size, new_size;
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@ -3534,16 +3534,46 @@ larger_vector (Lisp_Object vec, ptrdiff_t incr_min, ptrdiff_t nitems_max)
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new_size = old_size + incr;
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v = allocate_vector (new_size);
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memcpy (v->contents, XVECTOR (vec)->contents, old_size * sizeof *v->contents);
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memclear (v->contents + old_size, incr * word_size);
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XSETVECTOR (vec, v);
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return vec;
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}
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/* Likewise, except set new entries in the resulting vector to nil. */
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Lisp_Object
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larger_vector (Lisp_Object vec, ptrdiff_t incr_min, ptrdiff_t nitems_max)
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{
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ptrdiff_t old_size = ASIZE (vec);
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Lisp_Object v = larger_vecalloc (vec, incr_min, nitems_max);
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ptrdiff_t new_size = ASIZE (v);
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memclear (XVECTOR (v)->contents + old_size,
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(new_size - old_size) * word_size);
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return v;
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}
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/***********************************************************************
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Low-level Functions
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***********************************************************************/
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/* Return the index of the next entry in H following the one at IDX,
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or -1 if none. */
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static ptrdiff_t
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HASH_NEXT (struct Lisp_Hash_Table *h, ptrdiff_t idx)
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{
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return XINT (AREF (h->next, idx));
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}
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/* Return the index of the element in hash table H that is the start
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of the collision list at index IDX, or -1 if the list is empty. */
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static ptrdiff_t
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HASH_INDEX (struct Lisp_Hash_Table *h, ptrdiff_t idx)
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{
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return XINT (AREF (h->index, idx));
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}
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/* Compare KEY1 which has hash code HASH1 and KEY2 with hash code
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HASH2 in hash table H using `eql'. Value is true if KEY1 and
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KEY2 are the same. */
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@ -3715,14 +3745,14 @@ make_hash_table (struct hash_table_test test,
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h->count = 0;
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h->key_and_value = Fmake_vector (make_number (2 * sz), Qnil);
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h->hash = Fmake_vector (size, Qnil);
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h->next = Fmake_vector (size, Qnil);
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h->index = Fmake_vector (make_number (index_size), Qnil);
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h->next = Fmake_vector (size, make_number (-1));
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h->index = Fmake_vector (make_number (index_size), make_number (-1));
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h->pure = pure;
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/* Set up the free list. */
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for (i = 0; i < sz - 1; ++i)
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set_hash_next_slot (h, i, make_number (i + 1));
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h->next_free = make_number (0);
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set_hash_next_slot (h, i, i + 1);
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h->next_free = 0;
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XSET_HASH_TABLE (table, h);
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eassert (HASH_TABLE_P (table));
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@ -3775,7 +3805,7 @@ copy_hash_table (struct Lisp_Hash_Table *h1)
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static void
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maybe_resize_hash_table (struct Lisp_Hash_Table *h)
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{
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if (NILP (h->next_free))
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if (h->next_free < 0)
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{
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ptrdiff_t old_size = HASH_TABLE_SIZE (h);
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EMACS_INT new_size, index_size, nsize;
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@ -3813,29 +3843,32 @@ maybe_resize_hash_table (struct Lisp_Hash_Table *h)
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set_hash_key_and_value (h, larger_vector (h->key_and_value,
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2 * (new_size - old_size), -1));
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set_hash_next (h, larger_vector (h->next, new_size - old_size, -1));
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set_hash_hash (h, larger_vector (h->hash, new_size - old_size, -1));
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set_hash_index (h, Fmake_vector (make_number (index_size), Qnil));
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set_hash_index (h, Fmake_vector (make_number (index_size),
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make_number (-1)));
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set_hash_next (h, larger_vecalloc (h->next, new_size - old_size, -1));
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/* Update the free list. Do it so that new entries are added at
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the end of the free list. This makes some operations like
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maphash faster. */
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for (i = old_size; i < new_size - 1; ++i)
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set_hash_next_slot (h, i, make_number (i + 1));
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set_hash_next_slot (h, i, i + 1);
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set_hash_next_slot (h, i, -1);
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if (!NILP (h->next_free))
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{
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Lisp_Object last, next;
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last = h->next_free;
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while (next = HASH_NEXT (h, XFASTINT (last)),
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!NILP (next))
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last = next;
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set_hash_next_slot (h, XFASTINT (last), make_number (old_size));
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}
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if (h->next_free < 0)
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h->next_free = old_size;
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else
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XSETFASTINT (h->next_free, old_size);
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{
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ptrdiff_t last = h->next_free;
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while (true)
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{
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ptrdiff_t next = HASH_NEXT (h, last);
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if (next < 0)
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break;
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last = next;
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}
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set_hash_next_slot (h, last, old_size);
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}
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/* Rehash. */
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for (i = 0; i < old_size; ++i)
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@ -3844,7 +3877,7 @@ maybe_resize_hash_table (struct Lisp_Hash_Table *h)
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EMACS_UINT hash_code = XUINT (HASH_HASH (h, i));
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ptrdiff_t start_of_bucket = hash_code % ASIZE (h->index);
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set_hash_next_slot (h, i, HASH_INDEX (h, start_of_bucket));
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set_hash_index_slot (h, start_of_bucket, make_number (i));
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set_hash_index_slot (h, start_of_bucket, i);
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}
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}
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}
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@ -3858,8 +3891,7 @@ ptrdiff_t
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hash_lookup (struct Lisp_Hash_Table *h, Lisp_Object key, EMACS_UINT *hash)
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{
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EMACS_UINT hash_code;
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ptrdiff_t start_of_bucket;
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Lisp_Object idx;
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ptrdiff_t start_of_bucket, i;
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hash_code = h->test.hashfn (&h->test, key);
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eassert ((hash_code & ~INTMASK) == 0);
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@ -3867,20 +3899,15 @@ hash_lookup (struct Lisp_Hash_Table *h, Lisp_Object key, EMACS_UINT *hash)
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*hash = hash_code;
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start_of_bucket = hash_code % ASIZE (h->index);
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idx = HASH_INDEX (h, start_of_bucket);
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while (!NILP (idx))
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{
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ptrdiff_t i = XFASTINT (idx);
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if (EQ (key, HASH_KEY (h, i))
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|| (h->test.cmpfn
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&& hash_code == XUINT (HASH_HASH (h, i))
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&& h->test.cmpfn (&h->test, key, HASH_KEY (h, i))))
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break;
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idx = HASH_NEXT (h, i);
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}
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for (i = HASH_INDEX (h, start_of_bucket); 0 <= i; i = HASH_NEXT (h, i))
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if (EQ (key, HASH_KEY (h, i))
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|| (h->test.cmpfn
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&& hash_code == XUINT (HASH_HASH (h, i))
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&& h->test.cmpfn (&h->test, key, HASH_KEY (h, i))))
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break;
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return NILP (idx) ? -1 : XFASTINT (idx);
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return i;
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}
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@ -3901,7 +3928,7 @@ hash_put (struct Lisp_Hash_Table *h, Lisp_Object key, Lisp_Object value,
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h->count++;
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/* Store key/value in the key_and_value vector. */
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i = XFASTINT (h->next_free);
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i = h->next_free;
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h->next_free = HASH_NEXT (h, i);
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set_hash_key_slot (h, i, key);
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set_hash_value_slot (h, i, value);
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@ -3912,7 +3939,7 @@ hash_put (struct Lisp_Hash_Table *h, Lisp_Object key, Lisp_Object value,
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/* Add new entry to its collision chain. */
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start_of_bucket = hash % ASIZE (h->index);
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set_hash_next_slot (h, i, HASH_INDEX (h, start_of_bucket));
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set_hash_index_slot (h, start_of_bucket, make_number (i));
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set_hash_index_slot (h, start_of_bucket, i);
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return i;
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}
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@ -3922,30 +3949,25 @@ hash_put (struct Lisp_Hash_Table *h, Lisp_Object key, Lisp_Object value,
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void
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hash_remove_from_table (struct Lisp_Hash_Table *h, Lisp_Object key)
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{
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EMACS_UINT hash_code;
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ptrdiff_t start_of_bucket;
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Lisp_Object idx, prev;
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hash_code = h->test.hashfn (&h->test, key);
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EMACS_UINT hash_code = h->test.hashfn (&h->test, key);
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eassert ((hash_code & ~INTMASK) == 0);
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start_of_bucket = hash_code % ASIZE (h->index);
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idx = HASH_INDEX (h, start_of_bucket);
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prev = Qnil;
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ptrdiff_t start_of_bucket = hash_code % ASIZE (h->index);
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ptrdiff_t prev = -1;
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while (!NILP (idx))
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for (ptrdiff_t i = HASH_INDEX (h, start_of_bucket);
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0 <= i;
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i = HASH_NEXT (h, i))
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{
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ptrdiff_t i = XFASTINT (idx);
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if (EQ (key, HASH_KEY (h, i))
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|| (h->test.cmpfn
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&& hash_code == XUINT (HASH_HASH (h, i))
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&& h->test.cmpfn (&h->test, key, HASH_KEY (h, i))))
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{
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/* Take entry out of collision chain. */
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if (NILP (prev))
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if (prev < 0)
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set_hash_index_slot (h, start_of_bucket, HASH_NEXT (h, i));
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else
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set_hash_next_slot (h, XFASTINT (prev), HASH_NEXT (h, i));
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set_hash_next_slot (h, prev, HASH_NEXT (h, i));
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/* Clear slots in key_and_value and add the slots to
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the free list. */
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@ -3953,16 +3975,13 @@ hash_remove_from_table (struct Lisp_Hash_Table *h, Lisp_Object key)
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set_hash_value_slot (h, i, Qnil);
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set_hash_hash_slot (h, i, Qnil);
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set_hash_next_slot (h, i, h->next_free);
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h->next_free = make_number (i);
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h->next_free = i;
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h->count--;
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eassert (h->count >= 0);
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break;
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}
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else
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{
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prev = idx;
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idx = HASH_NEXT (h, i);
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}
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prev = i;
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}
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}
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@ -3978,16 +3997,16 @@ hash_clear (struct Lisp_Hash_Table *h)
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for (i = 0; i < size; ++i)
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{
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set_hash_next_slot (h, i, i < size - 1 ? make_number (i + 1) : Qnil);
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set_hash_next_slot (h, i, i < size - 1 ? i + 1 : -1);
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set_hash_key_slot (h, i, Qnil);
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set_hash_value_slot (h, i, Qnil);
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set_hash_hash_slot (h, i, Qnil);
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}
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for (i = 0; i < ASIZE (h->index); ++i)
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ASET (h->index, i, Qnil);
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ASET (h->index, i, make_number (-1));
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h->next_free = make_number (0);
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h->next_free = 0;
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h->count = 0;
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}
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}
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@ -4011,14 +4030,12 @@ sweep_weak_table (struct Lisp_Hash_Table *h, bool remove_entries_p)
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for (ptrdiff_t bucket = 0; bucket < n; ++bucket)
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{
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Lisp_Object idx, next, prev;
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/* Follow collision chain, removing entries that
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don't survive this garbage collection. */
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prev = Qnil;
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for (idx = HASH_INDEX (h, bucket); !NILP (idx); idx = next)
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ptrdiff_t prev = -1;
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ptrdiff_t next;
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for (ptrdiff_t i = HASH_INDEX (h, bucket); 0 <= i; i = next)
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{
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ptrdiff_t i = XFASTINT (idx);
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bool key_known_to_survive_p = survives_gc_p (HASH_KEY (h, i));
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bool value_known_to_survive_p = survives_gc_p (HASH_VALUE (h, i));
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bool remove_p;
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@ -4041,14 +4058,14 @@ sweep_weak_table (struct Lisp_Hash_Table *h, bool remove_entries_p)
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if (remove_p)
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{
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/* Take out of collision chain. */
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if (NILP (prev))
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if (prev < 0)
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set_hash_index_slot (h, bucket, next);
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else
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set_hash_next_slot (h, XFASTINT (prev), next);
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set_hash_next_slot (h, prev, next);
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/* Add to free list. */
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set_hash_next_slot (h, i, h->next_free);
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h->next_free = idx;
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h->next_free = i;
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/* Clear key, value, and hash. */
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set_hash_key_slot (h, i, Qnil);
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@ -4059,7 +4076,7 @@ sweep_weak_table (struct Lisp_Hash_Table *h, bool remove_entries_p)
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}
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else
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{
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prev = idx;
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prev = i;
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}
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}
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else
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28
src/lisp.h
28
src/lisp.h
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@ -1980,13 +1980,12 @@ struct Lisp_Hash_Table
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/* Vector used to chain entries. If entry I is free, next[I] is the
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entry number of the next free item. If entry I is non-free,
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next[I] is the index of the next entry in the collision chain. */
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next[I] is the index of the next entry in the collision chain,
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or -1 if there is such entry. */
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Lisp_Object next;
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/* Index of first free entry in free list. */
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Lisp_Object next_free;
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/* Bucket vector. A non-nil entry is the index of the first item in
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/* Bucket vector. An entry of -1 indicates no item is present,
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and a nonnegative entry is the index of the first item in
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a collision chain. This vector's size can be larger than the
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hash table size to reduce collisions. */
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Lisp_Object index;
|
||||
|
|
@ -1998,6 +1997,9 @@ struct Lisp_Hash_Table
|
|||
/* Number of key/value entries in the table. */
|
||||
ptrdiff_t count;
|
||||
|
||||
/* Index of first free entry in free list, or -1 if none. */
|
||||
ptrdiff_t next_free;
|
||||
|
||||
/* True if the table can be purecopied. The table cannot be
|
||||
changed afterwards. */
|
||||
bool pure;
|
||||
|
|
@ -2050,14 +2052,6 @@ HASH_VALUE (struct Lisp_Hash_Table *h, ptrdiff_t idx)
|
|||
return AREF (h->key_and_value, 2 * idx + 1);
|
||||
}
|
||||
|
||||
/* Value is the index of the next entry following the one at IDX
|
||||
in hash table H. */
|
||||
INLINE Lisp_Object
|
||||
HASH_NEXT (struct Lisp_Hash_Table *h, ptrdiff_t idx)
|
||||
{
|
||||
return AREF (h->next, idx);
|
||||
}
|
||||
|
||||
/* Value is the hash code computed for entry IDX in hash table H. */
|
||||
INLINE Lisp_Object
|
||||
HASH_HASH (struct Lisp_Hash_Table *h, ptrdiff_t idx)
|
||||
|
|
@ -2065,14 +2059,6 @@ HASH_HASH (struct Lisp_Hash_Table *h, ptrdiff_t idx)
|
|||
return AREF (h->hash, idx);
|
||||
}
|
||||
|
||||
/* Value is the index of the element in hash table H that is the
|
||||
start of the collision list at index IDX in the index vector of H. */
|
||||
INLINE Lisp_Object
|
||||
HASH_INDEX (struct Lisp_Hash_Table *h, ptrdiff_t idx)
|
||||
{
|
||||
return AREF (h->index, idx);
|
||||
}
|
||||
|
||||
/* Value is the size of hash table H. */
|
||||
INLINE ptrdiff_t
|
||||
HASH_TABLE_SIZE (struct Lisp_Hash_Table *h)
|
||||
|
|
|
|||
|
|
@ -119,7 +119,7 @@ static void evict_lower_half (log_t *log)
|
|||
XSET_HASH_TABLE (tmp, log); /* FIXME: Use make_lisp_ptr. */
|
||||
Fremhash (key, tmp);
|
||||
}
|
||||
eassert (EQ (log->next_free, make_number (i)));
|
||||
eassert (log->next_free == i);
|
||||
|
||||
eassert (VECTORP (key));
|
||||
for (ptrdiff_t j = 0; j < ASIZE (key); j++)
|
||||
|
|
@ -139,11 +139,11 @@ record_backtrace (log_t *log, EMACS_INT count)
|
|||
Lisp_Object backtrace;
|
||||
ptrdiff_t index;
|
||||
|
||||
if (!INTEGERP (log->next_free))
|
||||
if (log->next_free < 0)
|
||||
/* FIXME: transfer the evicted counts to a special entry rather
|
||||
than dropping them on the floor. */
|
||||
evict_lower_half (log);
|
||||
index = XINT (log->next_free);
|
||||
index = log->next_free;
|
||||
|
||||
/* Get a "working memory" vector. */
|
||||
backtrace = HASH_KEY (log, index);
|
||||
|
|
@ -163,8 +163,8 @@ record_backtrace (log_t *log, EMACS_INT count)
|
|||
}
|
||||
else
|
||||
{ /* BEWARE! hash_put in general can allocate memory.
|
||||
But currently it only does that if log->next_free is nil. */
|
||||
eassert (!NILP (log->next_free));
|
||||
But currently it only does that if log->next_free is -1. */
|
||||
eassert (0 <= log->next_free);
|
||||
ptrdiff_t j = hash_put (log, backtrace, make_number (count), hash);
|
||||
/* Let's make sure we've put `backtrace' right where it
|
||||
already was to start with. */
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue