mingw/info/stabs/Function-Types.html

   1 <html lang="en">
   2 <head>
   3 <title>STABS</title>
   4 <meta http-equiv="Content-Type" content="text/html">
   5 <meta name="description" content="STABS">
   6 <meta name="generator" content="makeinfo 4.3">
   7 <link href="http://www.gnu.org/software/texinfo/" rel="generator-home">
   8 </head>
   9 <body>
  10 <div class="node">
  11 <p>
  12 Node:<a name="Function%20Types">Function Types</a>,
  13 Previous:<a rel="previous" accesskey="p" href="Unions.html#Unions">Unions</a>,
  14 Up:<a rel="up" accesskey="u" href="Types.html#Types">Types</a>
  15 <hr><br>
  16 </div>
  17
  18 <h3 class="section">Function Types</h3>
  19
  20    <p>Various types can be defined for function variables.  These types are
  21 not used in defining functions (see <a href="Procedures.html#Procedures">Procedures</a>); they are used for
  22 things like pointers to functions.
  23
  24    <p>The simple, traditional, type is type descriptor <code>f</code> is followed by
  25 type information for the return type of the function, followed by a
  26 semicolon.
  27
  28    <p>This does not deal with functions for which the number and types of the
  29 parameters are part of the type, as in Modula-2 or ANSI C.  AIX provides
  30 extensions to specify these, using the <code>f</code>, <code>F</code>, <code>p</code>, and
  31 <code>R</code> type descriptors.
  32
  33    <p>First comes the type descriptor.  If it is <code>f</code> or <code>F</code>, this
  34 type involves a function rather than a procedure, and the type
  35 information for the return type of the function follows, followed by a
  36 comma.  Then comes the number of parameters to the function and a
  37 semicolon.  Then, for each parameter, there is the name of the parameter
  38 followed by a colon (this is only present for type descriptors <code>R</code>
  39 and <code>F</code> which represent Pascal function or procedure parameters),
  40 type information for the parameter, a comma, 0 if passed by reference or
  41 1 if passed by value, and a semicolon.  The type definition ends with a
  42 semicolon.
  43
  44    <p>For example, this variable definition:
  45
  46 <pre class="example">     int (*g_pf)();
  47      </pre>
  48
  49 <p>generates the following code:
  50
  51 <pre class="example">     .stabs "g_pf:G24=*25=f1",32,0,0,0
  52          .common _g_pf,4,"bss"
  53      </pre>
  54
  55    <p>The variable defines a new type, 24, which is a pointer to another new
  56 type, 25, which is a function returning <code>int</code>.
  57
  58    </body></html>
  59