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<H1>Tutorial on Type Analysis</H1>
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<H1><A NAME="SEC3" HREF="typetutorial_toc.html#SEC3">Messages on Scope Rule Violations</A></H1>
<P>
Erroneous programs may violate the scope rules in one of two
cases:
<P>
<UL>
<LI>
A particular applied identifier occurrence has no valid defining
identifier occurrence.
<P>
<LI>
There are more than one defining identifier occurrences for one
identifier in one range.
</UL>
<P>
Such situations shall be indicated by error messages.
Furthermore, we want every defining occurrence of a multiply
defined identifier be marked by a message.
<P>
For that purpose we use the following two library modules:
<P>
<B>CoreChk.specs</B>[8]==
<PRE>
<TT>
$/Tech/Strings.specs
$/Prop/OccCnt.gnrc:inst
</TT>
</PRE>
<FONT SIZE=1>
<PRE>
This macro is attached to a product file.
</PRE>
</FONT>
<P>
The <CODE>Strings</CODE> module provides a function that concatenates
a error message string and an identifier for error messages
related to identifiers.
<P>
The <CODE>OccCnt</CODE> module provides computations that count how
often an object identified by a <CODE>Key</CODE> attribute occurs
in certain contexts, in our case in a defining context.
<P>
The check for existence of a definition is directly obtained from
the module role <CODE>ChkIdUse</CODE>.
For the second check we specify a computational role
<CODE>ChkUnique</CODE> in order to reuse it for several grammar symbols.
If an object occurs more than once in the <CODE>ChkUnique</CODE>
context it is multiply defined.
<P>
<B>CoreChk.lido</B>[9]==
<PRE>
<TT>
SYMBOL UseIdent INHERITS ChkIdUse END;
SYMBOL TypeUseIdent INHERITS ChkIdUse END;
SYMBOL DefIdent INHERITS ChkUnique END;
SYMBOL ChkUnique INHERITS Count, TotalCnt COMPUTE
IF (GT (THIS.TotalCnt, 1),
message (ERROR,
CatStrInd ("identifier is multiply defined: ",
THIS.Sym),
0, COORDREF));
END;
</TT>
</PRE>
<FONT SIZE=1>
<PRE>
This macro is attached to a product file.
</PRE>
</FONT>
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