| <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> |
| <html> |
| <!-- Copyright (C) 1992-2015 Free Software Foundation, Inc. |
| Contributed by Cygnus Support. Written by Julia Menapace, Jim Kingdon, |
| and David MacKenzie. |
| |
| Permission is granted to copy, distribute and/or modify this document |
| under the terms of the GNU Free Documentation License, Version 1.3 or |
| any later version published by the Free Software Foundation; with no |
| Invariant Sections, with no Front-Cover Texts, and with no Back-Cover |
| Texts. A copy of the license is included in the section entitled "GNU |
| Free Documentation License". --> |
| <!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ --> |
| <head> |
| <title>STABS: Cross-References</title> |
| |
| <meta name="description" content="STABS: Cross-References"> |
| <meta name="keywords" content="STABS: Cross-References"> |
| <meta name="resource-type" content="document"> |
| <meta name="distribution" content="global"> |
| <meta name="Generator" content="makeinfo"> |
| <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> |
| <link href="index.html#Top" rel="start" title="Top"> |
| <link href="Symbol-Types-Index.html#Symbol-Types-Index" rel="index" title="Symbol Types Index"> |
| <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> |
| <link href="Types.html#Types" rel="up" title="Types"> |
| <link href="Subranges.html#Subranges" rel="next" title="Subranges"> |
| <link href="Miscellaneous-Types.html#Miscellaneous-Types" rel="prev" title="Miscellaneous Types"> |
| <style type="text/css"> |
| <!-- |
| a.summary-letter {text-decoration: none} |
| blockquote.smallquotation {font-size: smaller} |
| div.display {margin-left: 3.2em} |
| div.example {margin-left: 3.2em} |
| div.indentedblock {margin-left: 3.2em} |
| div.lisp {margin-left: 3.2em} |
| div.smalldisplay {margin-left: 3.2em} |
| div.smallexample {margin-left: 3.2em} |
| div.smallindentedblock {margin-left: 3.2em; font-size: smaller} |
| div.smalllisp {margin-left: 3.2em} |
| kbd {font-style:oblique} |
| pre.display {font-family: inherit} |
| pre.format {font-family: inherit} |
| pre.menu-comment {font-family: serif} |
| pre.menu-preformatted {font-family: serif} |
| pre.smalldisplay {font-family: inherit; font-size: smaller} |
| pre.smallexample {font-size: smaller} |
| pre.smallformat {font-family: inherit; font-size: smaller} |
| pre.smalllisp {font-size: smaller} |
| span.nocodebreak {white-space:nowrap} |
| span.nolinebreak {white-space:nowrap} |
| span.roman {font-family:serif; font-weight:normal} |
| span.sansserif {font-family:sans-serif; font-weight:normal} |
| ul.no-bullet {list-style: none} |
| --> |
| </style> |
| |
| |
| </head> |
| |
| <body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> |
| <a name="Cross_002dReferences"></a> |
| <div class="header"> |
| <p> |
| 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> |
| </div> |
| <hr> |
| <a name="Cross_002dReferences-to-Other-Types"></a> |
| <h3 class="section">5.3 Cross-References to Other Types</h3> |
| |
| <p>A type can be used before it is defined; one common way to deal with |
| that situation is just to use a type reference to a type which has not |
| yet been defined. |
| </p> |
| <p>Another way is with the ‘<samp>x</samp>’ type descriptor, which is followed by |
| ‘<samp>s</samp>’ for a structure tag, ‘<samp>u</samp>’ for a union tag, or ‘<samp>e</samp>’ for |
| a enumerator tag, followed by the name of the tag, followed by ‘<samp>:</samp>’. |
| If the name contains ‘<samp>::</samp>’ between a ‘<samp><</samp>’ and ‘<samp>></samp>’ pair (for |
| C<tt>++</tt> templates), such a ‘<samp>::</samp>’ does not end the name—only a single |
| ‘<samp>:</samp>’ ends the name; see <a href="Nested-Symbols.html#Nested-Symbols">Nested Symbols</a>. |
| </p> |
| <p>For example, the following C declarations: |
| </p> |
| <div class="example"> |
| <pre class="example">struct foo; |
| struct foo *bar; |
| </pre></div> |
| |
| <p>produce: |
| </p> |
| <div class="example"> |
| <pre class="example">.stabs "bar:G16=*17=xsfoo:",32,0,0,0 |
| </pre></div> |
| |
| <p>Not all debuggers support the ‘<samp>x</samp>’ type descriptor, so on some |
| machines GCC does not use it. I believe that for the above example it |
| would just emit a reference to type 17 and never define it, but I |
| haven’t verified that. |
| </p> |
| <p>Modula-2 imported types, at least on AIX, use the ‘<samp>i</samp>’ type |
| descriptor, which is followed by the name of the module from which the |
| type is imported, followed by ‘<samp>:</samp>’, followed by the name of the |
| type. There is then optionally a comma followed by type information for |
| the type. This differs from merely naming the type (see <a href="Typedefs.html#Typedefs">Typedefs</a>) in |
| that it identifies the module; I don’t understand whether the name of |
| the type given here is always just the same as the name we are giving |
| it, or whether this type descriptor is used with a nameless stab |
| (see <a href="String-Field.html#String-Field">String Field</a>), or what. The symbol ends with ‘<samp>;</samp>’. |
| </p> |
| <hr> |
| <div class="header"> |
| <p> |
| 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> |
| </div> |
| |
| |
| |
| </body> |
| </html> |
