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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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28
src/alloc.c
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@ -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. */);