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This is a specially patched version of NASM. It can be used to supplement
building of Crystal Space, the Open Source 3D Engine project. You can find
Crystal Space at the following locations:
http://crystal.linuxgames.com/
http://crystal.sourceforge.net/
Details of changes in this version of NASM follow.
-*- A new keyword %xdefine and its case-insensitive counterpart %ixdefine.
They work almost the same way as %define and %idefine but expand
the definition immediately, not on the invocation. Something like a cross
between %define and %assign. The "x" suffix stands for "eXpand", so
"xdefine" can be deciphered as "expand-and-define". Thus you can do
things like this:
%assign ofs 0
%macro arg 1
%xdefine %1 dword [esp+ofs]
%assign ofs ofs+4
%endmacro
-*- Changed the place where the expansion of %$name macros are expanded.
Now they are converted into ..@ctxnum.name form when detokenizing, so
there are no quirks as before when using %$name arguments to macros,
in macros etc. For example:
%macro abc 1
%define %1 hello
%endm
abc %$here
%$here
Now last line will be expanded to "hello" as expected. This also allows
for lots of goodies, a good example are extended "proc" macros included
in this archive.
-*- Added a check for "cstk" in smacro_defined() before calling get_ctx() -
this allows for things like:
%ifdef %$abc
%endif
to work without warnings even in no context.
-*- Added a check for "cstk" in %if*ctx and %elif*ctx directives -
this allows to use %ifctx without excessive warnings. If there is
no active context, %ifctx goes through "false" branch.
-*- Removed "user error: " prefix with %error directive: it just clobbers the
output and has absolutely no functionality. Besides, this allows to write
macros that does not differ from build-in functions in any way.
-*- Added expansion of string that is output by %error directive. Now you
can do things like:
%define hello(x) Hello, x!
%define %$name andy
%error "hello(%$name)"
Same happened with %include directive.
-*- Now all directives that expect an identifier will try to expand and
concatenate everything without whitespaces in between before usage.
For example, with "unfixed" nasm the commands
%define %$abc hello
%define __%$abc goodbye
__%$abc
would produce "incorrect" output: last line will expand to
hello goodbyehello
Not quite what you expected, eh? :-) The answer is that preprocessor
treats the %define construct as if it would be
%define __ %$abc goodbye
(note the white space between __ and %$abc). After my "fix" it
will "correctly" expand into
goodbye
as expected. Note that I use quotes around words "correct", "incorrect"
etc because this is rather a feature not a bug; however current behaviour
is more logical (and allows more advanced macro usage :-).
Same change was applied to:
%push,%macro,%imacro,%define,%idefine,%xdefine,%ixdefine,
%assign,%iassign,%undef
-*- A new directive [WARNING {+|-}warning-id] have been added. It works only
if the assembly phase is enabled (i.e. it doesn't work with nasm -e).
-*- A new warning type: macro-selfref. By default this warning is disabled;
when enabled NASM warns when a macro self-references itself; for example
the following source:
[WARNING macro-selfref]
%macro push 1-*
%rep %0
push %1
%rotate 1
%endrep
%endmacro
push eax,ebx,ecx
will produce a warning, but if we remove the first line we won't see it
anymore (which is The Right Thing To Do {tm} IMHO since C preprocessor
eats such constructs without warnings at all).
-*- Added a "error" routine to preprocessor which always will set ERR_PASS1
bit in severity_code. This removes annoying repeated errors on first
and second passes from preprocessor.
-*- Added the %+ operator in single-line macros for concatenating two
identifiers. Usage example:
%define _myfunc _otherfunc
%define cextern(x) _ %+ x
cextern (myfunc)
After first expansion, third line will become "_myfunc". After this
expansion is performed again so it becomes "_otherunc".
-*- Now if preprocessor is in a non-emmitting state, no warning or error
will be emmitted. Example:
%if 1
mov eax,ebx
%else
put anything you want between these two brackets,
even macro-parameter references %1 or local labels %$zz
or macro-local labels %%zz - no warning will be emmitted.
%endif
-*- Context-local variables on expansion as a last resort are looked up
in outer contexts. For example, the following piece:
%push outer
%define %$a [esp]
%push inner
%$a
%pop
%pop
will expand correctly the fourth line to [esp]; if we'll define another
%$a inside the "inner" context, it will take precedence over outer
definition. However, this modification has been applied only to
expand_smacro and not to smacro_define: as a consequence expansion
looks in outer contexts, but %ifdef won't look in outer contexts.
This behaviour is needed because we don't want nested contexts to
act on already defined local macros. Example:
%define %$arg1 [esp+4]
test eax,eax
if nz
mov eax,%$arg1
endif
In this example the "if" mmacro enters into the "if" context, so %$arg1
is not valid anymore inside "if". Of course it could be worked around
by using explicitely %$$arg1 but this is ugly IMHO.
-------------------------------// fixes for 0.98 //-----------------------------
-*- Fixed memory leak in %undef. The origline wasn't freed before
exiting on success.
-----------------------------// Fixes for 0.98.01 //----------------------------
-*- Fixed trap in preprocessor when line expanded to empty set of tokens.
This happens, for example, in the following case:
#define SOMETHING
SOMETHING
Andrew Zabolotny <bit@eltech.ru>
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