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Re: Bug in emacs
From: |
era |
Subject: |
Re: Bug in emacs |
Date: |
14 Oct 2003 09:05:20 +0300 |
User-agent: |
Gnus/5.0808 (Gnus v5.8.8) Emacs/20.7 |
On Mon, 13 Oct 2003 10:28:06 -0600, Kevin Rodgers <ihs_4664@yahoo.com>
posted to gmane.emacs.bugs:
> era@iki.fi wrote:
>> I'm not sure what the bug really is. Perhaps it would be useful to
>> get a warning when compiling / evaling something when a macro +is+
>> in effect and the file you are compiling is not pulling it in
>> properly? Then at least you get a hint to fix it while you still
>> can, while those who do it right will not experience any adverse
>> effects.
> When the compiler comes across a (function arg ...) form, either the
> function is defined or it isn't. If it's defined, either as a function
> or a macro, all is well. If it's not defined, the compiler can't know
> whether it is a function or a macro and assumes it's a function. A
> macro can't be "in effect" if it's file was not loaded "properly".
What I'm saying is that macro expansion during compilation could
trigger a warning if the macro is not loaded properly by the code
which is being compiled. This is a fuzzy idea at best, but I was
thinking of something like:
0. Maintain a buffer of per-byte-compilation macros
1. When a new byte compilation starts, flush the buffer of macros.
Set a flag to indicate that byte compilation is in progress. (I
would kind of assume that this already happens but I haven't
checked.)
2. When byte compilation is taking place and a macro is defined, add
the macro to the buffer of per-byte-compilation macros with the
property "defined during compilation".
3. When byte compilation is taking place and a macro is expanded,
check in the buffer, and if the macro is not listed as having
been defined during this compilation, throw a warning.
4. When byte compilation finishes, the flag to indicate that byte
compilation is taking place will need to be taken down, of
course.
This obviously requires already-loaded requires etc to be performed
anew during byte compilation, or some cunning caching of the buffer
which keeps track of when and where a macro was defined (maybe make it
global and permanent per session instead of per-compilation?)
> The compiler does issue warnings when it encounters an undefined
> macro/function:
> While compiling the end of the data in file /home/kevinr/emacs/foo.el:
> ** the function bar is not known to be defined.
So now you'd also get something like
While compiling toplevel forms:
** reference to macro `foo' which was not defined during compilation
as a warning that the code may not execute correctly on a system where
the macro is not somehow automatically loaded before the compiled code
will be executed. (As a bonus maybe the `foo' could be clickable so
you could look at the macro's documentation and maybe find out where
it is defined.)
/* era */
--
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