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<!-- Crown Copyright (c) 1998 -->
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<TITLE>Supplementary UNIT</TITLE>
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<BODY TEXT="#000000" BGCOLOR="#FFFFFF" LINK="#0000FF" VLINK="#400080" ALINK="#FF0000">
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<H1><A NAME=S374>TDF Specification, Issue 4.0</A></H1>
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<H3>January 1998</H3>
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<A HREF="spec10.html"><IMG SRC="../images/next.gif" ALT="next section"></A>
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<A HREF="../index.html"><IMG SRC="../images/home.gif" ALT="TenDRA home page">
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<A HREF="spec12.html"><IMG SRC="../images/index.gif" ALT="document index"></A>
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<P>
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<HR>
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<DL>
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<DT><A HREF="#S375"><B>6.1</B> - LINKINFO_PROPS</A><DD>
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<DL>
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<DT><A HREF="#S376"><B>6.1.1</B> - make_linkinfos</A><DD>
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</DL>
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<DT><A HREF="#S377"><B>6.2</B> - LINKINFO</A><DD>
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<DL>
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<DT><A HREF="#S378"><B>6.2.1</B> - static_name_def</A><DD>
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<DT><A HREF="#S379"><B>6.2.2</B> - make_comment</A><DD>
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<DT><A HREF="#S380"><B>6.2.3</B> - make_weak_defn</A><DD>
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<DT><A HREF="#S381"><B>6.2.4</B> - make_weak_symbol</A><DD>
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</DL>
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</DL>
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<HR>
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<H1>6. Supplementary UNIT</H1>
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<A NAME=S375>
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<HR>
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<H2>6.1. <A NAME=M1>LINKINFO_PROPS</A></H2>
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<B>Number of encoding bits</B>: 0<BR>
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<B>Is coding extendable</B>: no<BR>
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<B>Unit identification</B>: <I>linkinfo</I><P>
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This is an additional <CODE>UNIT</CODE> which gives extra information
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about linking.
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<P>
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<A NAME=S376>
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<H3>6.1.1. <A NAME=M2>make_linkinfos</H3>
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<B>Encoding number</B>: 0<P>
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<PRE>
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<I>no_labels</I>: TDFINT
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<I>tds</I>: SLIST(LINKINFO)
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-> LINKINFO_PROPS
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</PRE>
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Makes the <CODE>UNIT</CODE>.
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<P>
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<A NAME=S377>
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<HR>
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<H2>6.2. <A NAME=M3>LINKINFO</A></H2>
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<B>Number of encoding bits</B>: 2<BR>
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<B>Is coding extendable</B>: yes<P>
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<A NAME=S378>
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<H3>6.2.1. <A NAME=M4>static_name_def</H3>
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<B>Encoding number</B>: 1<P>
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<PRE>
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<I>assexp</I>: EXP POINTER <I>x</I>
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<I>id</I>: TDFSTRING<I>(k, n)</I>
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-> LINKINFO
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</PRE>
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<I>assexp</I> will be an <I>obtain_tag</I> construction which refers
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to a <CODE>TAG</CODE> which is defined with <I>make_id_tagdef</I>,
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<I>make_var_tagdef</I> or <I>common_tagdef</I>. This <CODE>TAG</CODE>
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will not be linked to an <CODE>EXTERNAL</CODE>.
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<P>
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The name <I>id</I> shall be used (but not exported, i.e. <I>static</I>)
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to identify the definition for subsequent linking.
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<P>
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<I>This construction is likely to be needed for profiling, so that
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useful names appear for statically defined objects. It may also be
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needed when C++ is translated into C, in order to identify global
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initialisers.</I>
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<P>
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<A NAME=S379>
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<H3>6.2.2. <A NAME=M5>make_comment</H3>
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<B>Encoding number</B>: 2<P>
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<PRE>
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<I>n</I>: TDFSTRING<I>(k, n)</I>
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-> LINKINFO
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</PRE>
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<I>n</I> shall be incorporated into the object file as a comment,
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if this facility exists. Otherwise the construct is ignored.
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<P>
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<A NAME=S380>
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<H3>6.2.3. <A NAME=M6>make_weak_defn</H3>
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<B>Encoding number</B>: 3<P>
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<PRE>
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<I>namer</I>: EXP POINTER <I>x</I>
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<I>val</I>: EXP POINTER <I>y</I>
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-> LINKINFO
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</PRE>
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<I>namer</I> and <I>val</I> will be <I>obtain_tag</I> constructions
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which refer to <CODE>TAG</CODE>s which are defined with
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<I>make_id_tagdef</I>, <I>make_var_tagdef</I> or <I>common_tagdef</I>.
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They shall be made synonymous.
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<P>
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<A NAME=S381>
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<H3>6.2.4. <A NAME=M7>make_weak_symbol</H3>
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<B>Encoding number</B>: 4<P>
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<PRE>
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<I>id</I>: TDFSTRING<I>(k, n)</I>
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<I>val</I>: EXP POINTER <I>x</I>
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-> LINKINFO
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</PRE>
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<I>val</I> will be an <I>obtain_tag</I> construction which refers
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to a <CODE>TAG</CODE> which is defined with <I>make_id_tagdef</I>,
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<I>make_var_tagdef</I> or <I>common_tagdef</I>.
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<P>
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This <CODE>TAG</CODE> shall be made <I>weak</I> (in the same sense
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as in the SVID ABI Symbol Table), and <I>id</I> shall be synonymous
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with it.
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<P>
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<P>
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<HR>
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<P><I>Part of the <A HREF="../index.html">TenDRA Web</A>.<BR>Crown
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Copyright © 1998.</I></P>
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