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[smlnj] View of /sml/trunk/src/cm/Doc/bt-06-scripts.tex
 [smlnj] / sml / trunk / src / cm / Doc / bt-06-scripts.tex

# View of /sml/trunk/src/cm/Doc/bt-06-scripts.tex

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several internal changes related to C calls

% -*- latex -*-

\section{Scripts}

This section gives a detailed description for each script, its
function, and its options.  All scripts described here are located in
the {\tt src/system} directory.\footnote{If the current directory {\tt
.} is not on the shell's search path, then each script must be invoked
using an explicit {\tt ./}-prefix.  Example: {\tt ./makeml}.}

\subsection{The {\tt makeml} script}
\label{script:makeml}

This script is used after a successful run of {\tt CMB.make} (or {\tt
CMB.make'}).  It {\em links} the compiler and its interactive system,
forming a corresponding heap image.  In addition to that, it prepares
a new directory containing stable CM libraries to be used with the new
image.

One way of thinking about this is to view {\tt makeml} as a function
mapping a bootfile directory $b$ to a
pair consisting of a heap image {\tt $v$.{\it arch}-{\it osname}} and
a library directory {\tt $v$.lib}.  The strings $b$ and $v$ are
optional parameters; the defaults are {\tt sml.boot.{\it arch}-{\it os}}
for $b$ and {\tt sml} for $v$.

The script accepts a number of options as follows:

\begin{description}
\item[-o $v$] specifies a $v$ other than the default {\tt sml}.
\item[-boot $b$] specifies a $b$ other than the default {\tt
sml.boot.{\it arch}-{\it os}}.
\item[-quiet] instructs {\tt makeml} to greatly reduce its
diagnostic output.  In particular, the names of files being linked are
not shown.  The default for this can be controlled via a
boolean-valued environment variable {\tt MAKEML\_VERBOSITY}.  If the
variable is not set, then the default is {\tt true} (meaning verbose'').
\item[-verbose] is the opposite of {\tt -quiet}.
\item[-rebuild $u$] puts {\tt makeml} into a different mode: After
loading the executable section of all binfiles and linking them, it
will not read any static environments, will not initialize the usual
interactive system and will not produce a heap image.  Instead, it
internally invokes the equivalent of {\tt CMB.make' (SOME
\verb+"+$u$\verb+"+)}, thus recompiling everything again.  When
recompilation is complete, {\tt makeml} stops; the newly-built system
must be linked using a separate explicit invocation of {\tt makeml}.
Notice that {\tt $u$.boot.{\it arch}-{\it os}} must be different from
$b$.
\item[-rebuildlight $u$] is the same as {\tt -rebuild $u$} except that
the symbol {\tt LIGHT} will be defined (using {\tt CMB.symval}) for
the duration of the compilation.  The effect of this is that no
cross-compilers will be built (which can save considerable time).
Alternative names for {\bf -rebuildlight} are {\bf -light} and {\bf
-lightrebuild}.
\item[-bare] causes {\tt makeml} to build a reduced version of
the system without the compilation manager CM included.  This is
useful for people who are interested in an interactive system only.
\item[-run $r$] selects the executable for the SML/NJ runtime system.
The default is {../../bin/.run/run.{\it arch}-{\it osname}}.
\item[-alloc $a$] specifies the size of the SML/NJ garbage-collector's
allocation area.  The default depends on the current machine
architecture.
\end{description}

The most common usage is to simply say {\tt ./makeml} without any
arguments, taking advantage of the defaults as described above.

\subsection{The {\tt testml} script}

The {\tt testml} script launches a newly-built and newly-linked
interactive system.  It requires a previous run of the {\tt makeml}
script because it uses the heap image {\tt $v$.{\it arch}-{\it osname}}
and libraries in {\tt $v$.lib}.

If no arguments are given, $v$ defaults to {\tt sml}.  If at least one
argument is given, then $v$ is assumed to be the first one. All other
arguments are passed to the initialization routine of the interactive
system just like normal arguments to the {\tt sml} command would.

This means that one {\em must} specify a $v$ unless there are no
command-line arguments at all.

\subsection{The {\tt installml} script}

The {\tt installml} script moves a heap image {\tt $v$.{\it arch}-{\it osname}}
to {\tt ../../bin/.heap/sml.{\it arch}-{\it osname}}.  Moreover, it
moves the libraries under {\tt $v$.lib} to {\tt ../../lib} and updates
{\tt ../../lib/pathconfig} accordingly.

The script takes one optional argument which specifies $v$.  If no
argument is given, $v$ defaults to {\tt sml}.

\subsection{The {\tt fixpt} script}

One good test of whether a new version of the compiler is working
properly is to see if it compiles to a {\em fixed point}.  For this,
the compiler is compiled $n$ times with the result of the $(k-1)$st
compilation being responsible for compiling the $k$th version.
A fixed point is reached if two consecutive compilations produce
identical results.

The {\tt fixpt} script automates the task of compiling to a fixed
point.  It internally uses the {\tt sml} command for the first
compilation and the {\tt makeml} script with its {\tt -rebuild}
parameter for all subsequent runs.  This produces a series of bin-directories
{\tt $u$.bin.{\it arch}-{\it os}},
{\tt $u$1.bin.{\it arch}-{\it os}},
{\tt $u$2.bin.{\it arch}-{\it os}},$\ldots$
and boot-directories
{\tt $u$.boot.{\it arch}-{\it os}},
{\tt $u$1.boot.{\it arch}-{\it os}},
{\tt $u$2.boot.{\it arch}-{\it os}},$\ldots$
where $u$ is a common stem'' that is used for naming the whole series.

The {\tt fixpt} script accepts the following options:

\begin{description}
\item[-iter $n$] limits the number of iterations to $n$.  The default
for $n$ is 3.  If no fixed point is found after $n$ iterations, then
{\tt fixpt} terminates with an error message.
\item[-base $u$] selects the stem'' $u$ (see above).  The default is
{\tt sml}.
\item[-light] causes {\tt LIGHT} to be defined during compilation.
(See the discussion of {\tt makeml}'s {\tt -rebuildlight} option.)
\end{description}

Failure to reach a fixed point after 2 iterations usually indicates
some serious problem within the compiler.

\subsection{The {\tt allcross} script}

Finally, the {\tt allcross} script is handy for building bin- and
boot-files for all architectures.  The script currently takes no
arguments and compiles (and cross-compiles) for 6 supported
combinations of {\it arch} and {\it os}: {\tt alpha32-unix}, {\tt
hppa-unix}, {\tt ppc-unix}, {\tt sparc-unix}, {\tt x86-unix}, and {\tt
x86-win32}.


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