| <!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: Function Types</title> |
| |
| <meta name="description" content="STABS: Function Types"> |
| <meta name="keywords" content="STABS: Function Types"> |
| <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="Macro-define-and-undefine.html#Macro-define-and-undefine" rel="next" title="Macro define and undefine"> |
| <link href="Unions.html#Unions" rel="prev" title="Unions"> |
| <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="Function-Types"></a> |
| <div class="header"> |
| <p> |
| Previous: <a href="Unions.html#Unions" accesskey="p" rel="prev">Unions</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="Function-Types-1"></a> |
| <h3 class="section">5.11 Function Types</h3> |
| |
| <p>Various types can be defined for function variables. These types are |
| not used in defining functions (see <a href="Procedures.html#Procedures">Procedures</a>); they are used for |
| things like pointers to functions. |
| </p> |
| <p>The simple, traditional, type is type descriptor ‘<samp>f</samp>’ is followed by |
| type information for the return type of the function, followed by a |
| semicolon. |
| </p> |
| <p>This does not deal with functions for which the number and types of the |
| parameters are part of the type, as in Modula-2 or ANSI C. AIX provides |
| extensions to specify these, using the ‘<samp>f</samp>’, ‘<samp>F</samp>’, ‘<samp>p</samp>’, and |
| ‘<samp>R</samp>’ type descriptors. |
| </p> |
| <p>First comes the type descriptor. If it is ‘<samp>f</samp>’ or ‘<samp>F</samp>’, this |
| type involves a function rather than a procedure, and the type |
| information for the return type of the function follows, followed by a |
| comma. Then comes the number of parameters to the function and a |
| semicolon. Then, for each parameter, there is the name of the parameter |
| followed by a colon (this is only present for type descriptors ‘<samp>R</samp>’ |
| and ‘<samp>F</samp>’ which represent Pascal function or procedure parameters), |
| type information for the parameter, a comma, 0 if passed by reference or |
| 1 if passed by value, and a semicolon. The type definition ends with a |
| semicolon. |
| </p> |
| <p>For example, this variable definition: |
| </p> |
| <div class="example"> |
| <pre class="example">int (*g_pf)(); |
| </pre></div> |
| |
| <p>generates the following code: |
| </p> |
| <div class="example"> |
| <pre class="example">.stabs "g_pf:G24=*25=f1",32,0,0,0 |
| .common _g_pf,4,"bss" |
| </pre></div> |
| |
| <p>The variable defines a new type, 24, which is a pointer to another new |
| type, 25, which is a function returning <code>int</code>. |
| </p> |
| |
| |
| |
| </body> |
| </html> |
