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Hash-cons pure data.

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* alloc.c (Fpurecopy): Hash-cons if requested.
(syms_of_alloc): Update purify-flag docstring.
* loadup.el: Setup hash-cons for pure data.
This commit is contained in:
Stefan Monnier 2010-04-18 17:49:33 -04:00
parent f8ea0098d9
commit e951580547
4 changed files with 36 additions and 10 deletions
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2
lisp/ChangeLog
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@ -1,5 +1,7 @@
2010-04-18 Stefan Monnier <monnier@iro.umontreal.ca>
* loadup.el: Setup hash-cons for pure data.
Fix duplicate entries in cedet's loaddefs.el files.
* emacs-lisp/autoload.el (autoload-file-load-name): Be more clever.
Should make most file-local generated-autoload-file unnecessary.

11
lisp/loadup.el
View file

@ -64,6 +64,10 @@
(expand-file-name "international" dir)
(expand-file-name "textmodes" dir)))))
(if (eq t purify-flag)
;; Hash consing saved around 11% of pure space in my tests.
(setq purify-flag (make-hash-table :test 'equal)))
(message "Using load-path %s" load-path)
(if (or (member (nth 3 command-line-args) '("dump" "bootstrap"))
@ -345,6 +349,10 @@
;; At this point, we're ready to resume undo recording for scratch.
(buffer-enable-undo "*scratch*")
;; Avoid error if user loads some more libraries now and make sure the
;; hash-consing hash table is GC'd.
(setq purify-flag nil)
(if (null (garbage-collect))
(setq pure-space-overflow t))
@ -378,9 +386,6 @@
(add-name-to-file "emacs" name t)))
(kill-emacs)))
;; Avoid error if user loads some more libraries now.
(setq purify-flag nil)
;; For machines with CANNOT_DUMP defined in config.h,
;; this file must be loaded each time Emacs is run.
;; So run the startup code now. First, remove `-l loadup' from args.

5
src/ChangeLog
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@ -1,3 +1,8 @@
2010-04-18 Stefan Monnier <monnier@iro.umontreal.ca>
* alloc.c (Fpurecopy): Hash-cons if requested.
(syms_of_alloc): Update purify-flag docstring.
2010-04-18 Jan Djärv <jan.h.d@swipnet.se>
* gtkutil.c (xg_set_geometry): Set size in geometry string also.

28
src/alloc.c
View file

@ -4893,14 +4893,21 @@ Does not copy symbols. Copies strings without text properties. */)
if (PURE_POINTER_P (XPNTR (obj)))
return obj;
if (HASH_TABLE_P (Vpurify_flag)) /* Hash consing. */
{
Lisp_Object tmp = Fgethash (obj, Vpurify_flag, Qnil);
if (!NILP (tmp))
return tmp;
}
if (CONSP (obj))
return pure_cons (XCAR (obj), XCDR (obj));
obj = pure_cons (XCAR (obj), XCDR (obj));
else if (FLOATP (obj))
return make_pure_float (XFLOAT_DATA (obj));
obj = make_pure_float (XFLOAT_DATA (obj));
else if (STRINGP (obj))
return make_pure_string (SDATA (obj), SCHARS (obj),
SBYTES (obj),
STRING_MULTIBYTE (obj));
obj = make_pure_string (SDATA (obj), SCHARS (obj),
SBYTES (obj),
STRING_MULTIBYTE (obj));
else if (COMPILEDP (obj) || VECTORP (obj))
{
register struct Lisp_Vector *vec;
@ -4920,10 +4927,15 @@ Does not copy symbols. Copies strings without text properties. */)
}
else
XSETVECTOR (obj, vec);
return obj;
}
else if (MARKERP (obj))
error ("Attempt to copy a marker to pure storage");
else
/* Not purified, don't hash-cons. */
return obj;
if (HASH_TABLE_P (Vpurify_flag)) /* Hash consing. */
Fputhash (obj, obj, Vpurify_flag);
return obj;
}
@ -6371,7 +6383,9 @@ If this portion is smaller than `gc-cons-threshold', this is ignored. */);
DEFVAR_LISP ("purify-flag", &Vpurify_flag,
doc: /* Non-nil means loading Lisp code in order to dump an executable.
This means that certain objects should be allocated in shared (pure) space. */);
This means that certain objects should be allocated in shared (pure) space.
It can also be set to a hash-table, in which case this table is used to
do hash-consing of the objects allocated to pure space. */);
DEFVAR_BOOL ("garbage-collection-messages", &garbage_collection_messages,
doc: /* Non-nil means display messages at start and end of garbage collection. */);