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sectalign: Implement on/off mode

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And describe it in documentation. We've introduced
sectalign in 2.09rc series and have to provide an
ability to steer this feature.

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
This commit is contained in:
Cyrill Gorcunov 2010-08-12 19:09:28 +04:00
parent 41b17b1e31
commit 8cb43d3f68
2 changed files with 30 additions and 10 deletions
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27
doc/nasmdoc.src
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@ -4099,26 +4099,35 @@ boundary, for example, is a waste of effort. Again, NASM does not
check that the section's alignment characteristics are sensible for
the use of \c{ALIGN} or \c{ALIGNB}.
Both \c{ALIGN} and \c{ALIGNB} do call \c{SECTALIGN} macro implicitly.
See \k{sectalign} for details.
See also the \c{smartalign} standard macro package, \k{pkg_smartalign}.
\S{sectalign} \i\c{SECTALIGN}: Section Alignment
The \c{SECTALIGN} macros provides a way to modify alignment attribute
of output file section. Unlike the \c{align=} attribute allowed at section
definition only the \c{SECTALIGN} macro may be used any time you need it.
of output file section. Unlike the \c{align=} attribute (which is allowed
at section definition only) the \c{SECTALIGN} macro may be used at any time.
For example the statement
For example the directive
\c
\c SECTALIGN 16
\c
sets a section alignment requirement to 16 bytes. Note that once increased
the section alignment can not be decreased, the magnitude can grow only.
sets the section alignment requirements to 16 bytes. Once increased it can
not be decreased, the magnitude may grow only.
It must be also noted that \c{SECTALIGN} gets called implicitly inside \c{ALIGN}
handler and as result \c{ALIGN} may update section alignment.
Note that \c{ALIGN} (see \k{align}) calls the \c{SECTALIGN} macro implicitly
so the active section alignment requirements may be updated. This is by default
behaviour, if for some reason you want the \c{ALIGN} do not call \c{SECTALIGN}
at all use the directive
\c SECTALIGN OFF
It is still possible to turn in on again by
\c SECTALIGN ON
\C{macropkg} \i{Standard Macro Packages}

13
standard.mac
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@ -68,8 +68,19 @@
__SECT__
%endmacro
%define __SECTALIGN_ALIGN_UPDATES_SECTION__ 1
%imacro sectalign 1.nolist
[sectalign %1]
%ifnum %1
%if __SECTALIGN_ALIGN_UPDATES_SECTION__ = 1
[sectalign %1]
%endif
%else
%ifidni %1,off
%define __SECTALIGN_ALIGN_UPDATES_SECTION__ 0
%elifidni %1,on
%define __SECTALIGN_ALIGN_UPDATES_SECTION__ 1
%endif
%endif
%endmacro
%imacro absolute 1+.nolist