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119 lines
5.7 KiB
HTML
119 lines
5.7 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1992-2019 Free Software Foundation, Inc.
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Contributed by Cygnus Support. Written by Julia Menapace, Jim Kingdon,
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and David MacKenzie.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with no
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Texts. A copy of the license is included in the section entitled "GNU
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Free Documentation License". -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Cross-References (STABS)</title>
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<meta name="description" content="Cross-References (STABS)">
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<meta name="keywords" content="Cross-References (STABS)">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Symbol-Types-Index.html#Symbol-Types-Index" rel="index" title="Symbol Types Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Types.html#Types" rel="up" title="Types">
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<link href="Subranges.html#Subranges" rel="next" title="Subranges">
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<link href="Miscellaneous-Types.html#Miscellaneous-Types" rel="prev" title="Miscellaneous Types">
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</head>
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<body lang="en">
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<a name="Cross_002dReferences"></a>
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<div class="header">
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<p>
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Next: <a href="Subranges.html#Subranges" accesskey="n" rel="next">Subranges</a>, Previous: <a href="Miscellaneous-Types.html#Miscellaneous-Types" accesskey="p" rel="prev">Miscellaneous Types</a>, Up: <a href="Types.html#Types" accesskey="u" rel="up">Types</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Symbol-Types-Index.html#Symbol-Types-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Cross_002dReferences-to-Other-Types"></a>
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<h3 class="section">5.3 Cross-References to Other Types</h3>
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<p>A type can be used before it is defined; one common way to deal with
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that situation is just to use a type reference to a type which has not
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yet been defined.
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</p>
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<p>Another way is with the ‘<samp>x</samp>’ type descriptor, which is followed by
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‘<samp>s</samp>’ for a structure tag, ‘<samp>u</samp>’ for a union tag, or ‘<samp>e</samp>’ for
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a enumerator tag, followed by the name of the tag, followed by ‘<samp>:</samp>’.
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If the name contains ‘<samp>::</samp>’ between a ‘<samp><</samp>’ and ‘<samp>></samp>’ pair (for
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C<tt>++</tt> templates), such a ‘<samp>::</samp>’ does not end the name—only a single
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‘<samp>:</samp>’ ends the name; see <a href="Nested-Symbols.html#Nested-Symbols">Nested Symbols</a>.
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</p>
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<p>For example, the following C declarations:
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</p>
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<div class="example">
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<pre class="example">struct foo;
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struct foo *bar;
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</pre></div>
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<p>produce:
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</p>
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<div class="example">
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<pre class="example">.stabs "bar:G16=*17=xsfoo:",32,0,0,0
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</pre></div>
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<p>Not all debuggers support the ‘<samp>x</samp>’ type descriptor, so on some
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machines GCC does not use it. I believe that for the above example it
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would just emit a reference to type 17 and never define it, but I
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haven’t verified that.
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</p>
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<p>Modula-2 imported types, at least on AIX, use the ‘<samp>i</samp>’ type
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descriptor, which is followed by the name of the module from which the
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type is imported, followed by ‘<samp>:</samp>’, followed by the name of the
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type. There is then optionally a comma followed by type information for
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the type. This differs from merely naming the type (see <a href="Typedefs.html#Typedefs">Typedefs</a>) in
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that it identifies the module; I don’t understand whether the name of
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the type given here is always just the same as the name we are giving
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it, or whether this type descriptor is used with a nameless stab
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(see <a href="String-Field.html#String-Field">String Field</a>), or what. The symbol ends with ‘<samp>;</samp>’.
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</p>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Subranges.html#Subranges" accesskey="n" rel="next">Subranges</a>, Previous: <a href="Miscellaneous-Types.html#Miscellaneous-Types" accesskey="p" rel="prev">Miscellaneous Types</a>, Up: <a href="Types.html#Types" accesskey="u" rel="up">Types</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Symbol-Types-Index.html#Symbol-Types-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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</html>
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