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<H1> H.2 Documentation of Implementation Decisions</H1>
<H4 ALIGN=CENTER>Documentation Requirements</H4>
<DIV Class="Paranum"><FONT SIZE=-2>1</FONT></DIV>
<DIV Class="Normal"> <A NAME="I7299"></A>The implementation shall document
the range of effects for each situation that the language rules identify
as either a bounded error or as having an unspecified effect. If the
implementation can constrain the effects of erroneous execution for a
given construct, then it shall document such constraints. [The documentation
might be provided either independently of any compilation unit or partition,
or as part of an annotated listing for a given unit or partition. See
also <A HREF="AA-1-1-3.html">1.1.3</A>, and <A HREF="AA-1-1-2.html">1.1.2</A>.]
</DIV>
<DIV Class="Paranum"><FONT SIZE=-2>1.a</FONT></DIV>
<DIV Class="Annotations"><FONT SIZE=-1><B>Implementation defined: </B>Information
regarding bounded errors and erroneous execution.</FONT></DIV>
<DIV Class="NotesHeader"><FONT SIZE=-1>NOTES</FONT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>2</FONT></DIV>
<DIV Class="Notes"><FONT SIZE=-1>5 Among the situations to
be documented are the conventions chosen for parameter passing, the methods
used for the management of run-time storage, and the method used to evaluate
numeric expressions if this involves extended range or extra precision.
</FONT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>2.a</FONT></DIV>
<DIV Class="Annotations"><FONT SIZE=-1><B>Discussion: </B>Look up ``unspecified''
and ``erroneous execution'' in the index for a list of the cases.</FONT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>2.b</FONT></DIV>
<DIV Class="Annotations"><FONT SIZE=-1>The management of run-time storage
is particularly important. For safety applications, it is often necessary
to show that a program cannot raise Storage_Error, and for security applications
that information cannot leak via the run-time system. Users are likely
to prefer a simple storage model that can be easily validated.</FONT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>2.c</FONT></DIV>
<DIV Class="Annotations"><FONT SIZE=-1>The documentation could helpfully
take into account that users may well adopt a subset to avoid some forms
of erroneous execution, for instance, not using the abort statement,
so that the effects of a partly completed <FONT FACE="Arial, Helvetica">assignment_statement</FONT>
do not have to be considered in the validation of a program (see <A HREF="AA-9-8.html">9.8</A>).
For this reason documentation linked to an actual compilation may be
most useful. Similarly, an implementation may be able to take into account
use of the Restrictions pragma.</FONT></DIV>
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