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From: Keith Kanios on 6 Aug 2010 01:44
This is a preliminary announcement regarding the rewrite/revamp of the
NASM preprocessor.

This rewrite addresses issues with implementing recursive macros
(%rmacro/%irmacro) as previously attempted, %exitmacro and also makes
room for new directives.

New NASM Directives:

* %rmacro: Recursive Macro, can be called arbitrarily deep (really
high limit [2^20] set to catch infinite loops.)
* %irmacro: Same as above, except case-insensitive like %imacro.
* %exitmacro: Terminates the current macro invocation, much like
%exitrep; can be nested in other preprocessor directives (e.g. %if/
%endif) within the macro, with exception of another macro, of course.
* %while/%endwhile/%exitwhile: A fusion between %rep and %if.
* %comment/%endcomment: Comment block for long/multi-line
comments. A little syntactic sugar, if you will.
* %final: Causes rest of line after %final to be preprocessed
after all other "normal" preprocessing is complete. Multiple %final
directives work like the x86 stack, LIFO/FILO.


This rewrite also attempts to address heavy/nested macro invocation
efficiency issues.

This rewrite is currently a branch [in GIT] called preprocessor-
rewrite, and tentatively labeled as version 2.10rc1. Please note that
NASM 2.09rc (official/main/master) is still going and NASM 2.09 should
be released fairly soon.

This rewrite has been known to accurately build all NASMX demos, along
with a variety of other code snippets by various people.

As positive/successful as this rewrite has been thus far, it is still
a major change and we would like to catch as many bugs as possible
before merging it into the main/master NASM code base.

Please help us test this rewrite further by downloading/compiling the
preprocessor-rewrite branch of the NASM source code, and testing it
against your NASM code/snippets.

Windows (Win32/MinGW) Binaries: http://www.asmcommunity.net/downloads/nasm/preproc-rewrite.zip
(these binaries will be updated when new preproc-rewrite updates are
made, along with a corresponding reply to this thread.)

Source Download via Browser: goto http://repo.or.cz/w/nasm.git/shortlog/refs/heads/preproc-rewrite
and click on the top-most tar.gz or zip "snapshot" link, decompress/
unarchive accordingly.

Source Download via GIT:

git clone git://repo.or.cz/nasm.git preproc-rewrite
cd ./preproc-rewrite
git checkout origin/preproc-rewrite


Compiling on MacOSX/FreeBSD/Linux/et al.: (assumes you are in the
preproc-rewrite directory of the downloaded source)

autoheader
autoconf
../configure
make


Shell Script for GIT Download + Compiling on MacOSX/FreeBSD/Linux/etc
al.:

#!/bin/sh
git clone git://repo.or.cz/nasm.git preproc-rewrite
cd ./preproc-rewrite
git checkout origin/preproc-rewrite
autoheader
autoconf
../configure
make


If you are comfortable enough with making this branch of NASM your
primary binary on MacOSX/FreeBSD/Linux/et al., follow the above
compile instructions with: sudo make install

If there are any questions/comments/corrections/concerns, please reply
to this thread.

Thanks. -Keith
From: Keith Kanios on 6 Aug 2010 08:03
Update: Fixed a bug regarding the emission of labels that immediately
precede macro invocations. The new source/binaries are available, and
can be found as instructed in the initial post.

Note: The latest x264 source successfully builds and passes checkasm
with this preprocessor rewrite of NASM.
From: Keith Kanios on 9 Aug 2010 02:31
Update: Fixed line number handling.
From: Keith Kanios on 10 Aug 2010 00:35
Update: Fixed macro-relative line number handling for %warning/%error/
%fatal/etc. This update, combined with the general preprocessor
redesign, now allows for %warning/%error/%fatal lines within %rep
blocks, that are nested within macros, to correctly emit the exact
macro-relative line number.

Update: Context-local labels will no longer implicitly search upper/
outer contexts in the case of undefined labels. This feature was added
in NASM 0.98.03, and is now being removed due to its unintuitive and
error-prone design. There will be a deprecation warning for "usage" of
this feature in the NASM 2.09. For NASM 2.10 and beyond, relying on
this context-local label fallthrough will simply generate an
expression syntax error. If you rely on this soon-to-be deprecated
feature, please take this time to adjust your code, accordingly.

Note: The Win32 Binaries link has changed: http://www.nasm.us/downloads/preproc-rewrite.zip
From: wolfgang kern on 10 Aug 2010 14:50

Keith Kanios posted:

> Update: Fixed macro-relative line number handling for %warning/%error/
> %fatal/etc. This update, combined with the general preprocessor
> redesign, now allows for %warning/%error/%fatal lines within %rep
> blocks, that are nested within macros, to correctly emit the exact
> macro-relative line number.

> Update: Context-local labels will no longer implicitly search upper/
> outer contexts in the case of undefined labels. This feature was added
> in NASM 0.98.03, and is now being removed due to its unintuitive and
> error-prone design. There will be a deprecation warning for "usage" of
> this feature in the NASM 2.09. For NASM 2.10 and beyond, relying on
> this context-local label fallthrough will simply generate an
> expression syntax error. If you rely on this soon-to-be deprecated
> feature, please take this time to adjust your code, accordingly.

> Note: The Win32 Binaries link has changed:
> http://www.nasm.us/downloads/preproc-rewrite.zip

Ok Keith, this may help a lot of users which like abstraction
by macros ...
For me personally every abstraction will hide what's really
going on on a machine and macros may often fool beginners.
So, using macros should be way apart from teaching newbies.

Please don't see my notes as offending, You actually created/modified
a very useful tool once named NASM :) for a horde of satisfied users.

__
wolfgang


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