From: "alin.s" <alinsoar@voila.fr>
To: Emacs-devel@gnu.org
Subject: Re: Watchpoints for emacs lisp.
Date: Sat, 15 May 2010 04:16:47 -0700 (PDT) [thread overview]
Message-ID: <28567671.post@talk.nabble.com> (raw)
In-Reply-To: <jwvvdau7cvy.fsf-monnier+emacs@gnu.org>
Stefan Monnier wrote:
>
>> I insert to the struct Lisp_Symbol a field :watched: .
>
> I think a good starting point is to use the existing `constant'
> field and just add a special WATCHED value to it (it already has 2bits
> but only uses 1, so you don't even need to make the field any larger).
>
>
Here is the symbol structure. Can you point your finger on the unused bit ?
/* In a symbol, the markbit of the plist is used as the gc mark bit */
struct Lisp_Symbol
{
unsigned gcmarkbit : 1;
/* Non-zero means symbol serves as a variable alias. The symbol
holding the real value is found in the value slot. */
unsigned indirect_variable : 1;
/* Non-zero means symbol is constant, i.e. changing its value
should signal an error. */
unsigned constant : 1;
/* Interned state of the symbol. This is an enumerator from
enum symbol_interned. */
unsigned interned : 2;
/* The symbol's name, as a Lisp string.
The name "xname" is used to intentionally break code referring to
the old field "name" of type pointer to struct Lisp_String. */
Lisp_Object xname;
/* Value of the symbol or Qunbound if unbound. If this symbol is a
defvaralias, `value' contains the symbol for which it is an
alias. Use the SYMBOL_VALUE and SET_SYMBOL_VALUE macros to get
and set a symbol's value, to take defvaralias into account. */
Lisp_Object value;
/* Function value of the symbol or Qunbound if not fboundp. */
Lisp_Object function;
/* The symbol's property list. */
Lisp_Object plist;
/* Next symbol in obarray bucket, if the symbol is interned. */
struct Lisp_Symbol *next;
};
--
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next prev parent reply other threads:[~2010-05-15 11:16 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-10 16:28 Watchpoints for emacs lisp alin.s
2010-05-11 11:59 ` Richard Stallman
2010-05-11 12:54 ` alin.s
2010-05-11 13:43 ` Ken Raeburn
2010-05-11 14:10 ` Stefan Monnier
2010-05-11 15:37 ` alin.s
2010-05-15 11:16 ` alin.s [this message]
2010-05-15 11:24 ` alin.s
2010-05-15 11:44 ` alin.s
2010-05-15 11:56 ` alin.s
2010-05-15 12:43 ` Helmut Eller
2010-05-15 13:06 ` alin.s
2010-05-15 17:48 ` Stefan Monnier
2010-05-16 13:07 ` alin.s
2010-05-16 13:09 ` Lennart Borgman
2010-05-16 13:42 ` alin.s
2010-05-16 16:28 ` Lennart Borgman
2010-05-16 19:46 ` alin.s
2010-05-16 20:42 ` Stefan Monnier
2010-05-16 21:10 ` alin.s
2010-05-17 13:24 ` Stefan Monnier
2010-05-15 12:15 ` Andreas Schwab
2010-05-15 17:43 ` Stefan Monnier
2010-05-16 13:05 ` alin.s
2010-05-16 15:03 ` Chad Brown
2010-05-16 19:44 ` alin.s
2010-05-16 21:31 ` alin.s
2010-05-16 22:38 ` alin.s
2010-05-16 23:47 ` Lennart Borgman
2010-05-16 23:56 ` alin.s
2010-05-17 15:52 ` alin.s
2010-05-17 16:09 ` Lennart Borgman
2010-05-17 16:40 ` alin.s
2010-05-17 17:00 ` Lennart Borgman
2010-05-17 17:29 ` alin.s
2010-05-17 18:39 ` alin.s
2010-05-17 18:41 ` alin.s
2010-05-17 20:22 ` alin.s
2010-05-17 18:59 ` Eli Zaretskii
2010-05-17 19:04 ` Lennart Borgman
2010-05-17 19:00 ` Chad Brown
2010-05-18 8:22 ` Adrian Robert
2010-05-18 19:46 ` Chad Brown
2010-05-18 22:38 ` Andreas Schwab
2010-05-24 14:36 ` alin.s
2010-05-24 14:46 ` Ken Raeburn
2010-05-26 8:27 ` alin.s
2010-05-24 15:12 ` alin.s
2010-05-24 17:36 ` Jan Djärv
2010-05-24 17:47 ` Stefan Monnier
2010-05-26 10:38 ` alin.s
2010-05-26 13:46 ` Stefan Monnier
2010-05-26 16:49 ` alin.s
2010-05-27 14:08 ` alin.s
2010-05-27 22:05 ` Andreas Schwab
2010-05-28 20:09 ` alin.s
2010-07-06 12:26 ` alin.s
2010-08-10 11:00 ` Stefan Monnier
2010-05-29 4:25 ` tomas
2010-05-19 4:30 ` Ken Raeburn
2010-05-19 6:20 ` Adrian Robert
2010-05-17 19:56 ` Andreas Schwab
-- strict thread matches above, loose matches on Subject: below --
2010-05-11 13:54 A. Soare
2010-05-12 1:53 ` Ken Raeburn
2010-05-12 2:04 ` Stephen J. Turnbull
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