86 lines
4.5 KiB
HTML
86 lines
4.5 KiB
HTML
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<html lang="en">
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<head>
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<title>Cross-References - STABS</title>
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<meta name="description" content="STABS">
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<meta name="generator" content="makeinfo 4.13">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Types.html#Types" title="Types">
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<link rel="prev" href="Miscellaneous-Types.html#Miscellaneous-Types" title="Miscellaneous Types">
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<link rel="next" href="Subranges.html#Subranges" title="Subranges">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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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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Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
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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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</head>
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<body>
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<div class="node">
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<a name="Cross-References"></a>
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<a name="Cross_002dReferences"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Subranges.html#Subranges">Subranges</a>,
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Previous: <a rel="previous" accesskey="p" href="Miscellaneous-Types.html#Miscellaneous-Types">Miscellaneous Types</a>,
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Up: <a rel="up" accesskey="u" href="Types.html#Types">Types</a>
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<hr>
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</div>
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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>Another way is with the ‘<samp><span class="samp">x</span></samp>’ type descriptor, which is followed by
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‘<samp><span class="samp">s</span></samp>’ for a structure tag, ‘<samp><span class="samp">u</span></samp>’ for a union tag, or ‘<samp><span class="samp">e</span></samp>’ for
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a enumerator tag, followed by the name of the tag, followed by ‘<samp><span class="samp">:</span></samp>’.
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If the name contains ‘<samp><span class="samp">::</span></samp>’ between a ‘<samp><span class="samp"><</span></samp>’ and ‘<samp><span class="samp">></span></samp>’ pair (for
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C<tt>++</tt> templates), such a ‘<samp><span class="samp">::</span></samp>’ does not end the name—only a single
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‘<samp><span class="samp">:</span></samp>’ ends the name; see <a href="Nested-Symbols.html#Nested-Symbols">Nested Symbols</a>.
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<p>For example, the following C declarations:
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<pre class="example"> struct foo;
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struct foo *bar;
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</pre>
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<p class="noindent">produce:
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<pre class="example"> .stabs "bar:G16=*17=xsfoo:",32,0,0,0
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</pre>
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<p>Not all debuggers support the ‘<samp><span class="samp">x</span></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>Modula-2 imported types, at least on AIX, use the ‘<samp><span class="samp">i</span></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><span class="samp">:</span></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><span class="samp">;</span></samp>’.
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</body></html>
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