You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
141 lines
6.1 KiB
HTML
141 lines
6.1 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
|
<html>
|
|
<!-- Copyright (C) 1992-2019 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 6.4, http://www.gnu.org/software/texinfo/ -->
|
|
<head>
|
|
<title>Methods (STABS)</title>
|
|
|
|
<meta name="description" content="Methods (STABS)">
|
|
<meta name="keywords" content="Methods (STABS)">
|
|
<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="Cplusplus.html#Cplusplus" rel="up" title="Cplusplus">
|
|
<link href="Method-Type-Descriptor.html#Method-Type-Descriptor" rel="next" title="Method Type Descriptor">
|
|
<link href="Class-Instance.html#Class-Instance" rel="prev" title="Class Instance">
|
|
<style type="text/css">
|
|
<!--
|
|
a.summary-letter {text-decoration: none}
|
|
blockquote.indentedblock {margin-right: 0em}
|
|
blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
|
|
blockquote.smallquotation {font-size: smaller}
|
|
div.display {margin-left: 3.2em}
|
|
div.example {margin-left: 3.2em}
|
|
div.lisp {margin-left: 3.2em}
|
|
div.smalldisplay {margin-left: 3.2em}
|
|
div.smallexample {margin-left: 3.2em}
|
|
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.nolinebreak {white-space: nowrap}
|
|
span.roman {font-family: initial; font-weight: normal}
|
|
span.sansserif {font-family: sans-serif; font-weight: normal}
|
|
ul.no-bullet {list-style: none}
|
|
-->
|
|
</style>
|
|
|
|
|
|
</head>
|
|
|
|
<body lang="en">
|
|
<a name="Methods"></a>
|
|
<div class="header">
|
|
<p>
|
|
Next: <a href="Method-Type-Descriptor.html#Method-Type-Descriptor" accesskey="n" rel="next">Method Type Descriptor</a>, Previous: <a href="Class-Instance.html#Class-Instance" accesskey="p" rel="prev">Class Instance</a>, Up: <a href="Cplusplus.html#Cplusplus" accesskey="u" rel="up">Cplusplus</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="Method-Definition"></a>
|
|
<h3 class="section">8.6 Method Definition</h3>
|
|
|
|
<p>The class definition shown above declares Ameth. The C<tt>++</tt> source below
|
|
defines Ameth:
|
|
</p>
|
|
<div class="example">
|
|
<pre class="example">int
|
|
baseA::Ameth(int in, char other)
|
|
{
|
|
return in;
|
|
};
|
|
</pre></div>
|
|
|
|
|
|
<p>This method definition yields three stabs following the code of the
|
|
method. One stab describes the method itself and following two describe
|
|
its parameters. Although there is only one formal argument all methods
|
|
have an implicit argument which is the <code>this</code> pointer. The <code>this</code>
|
|
pointer is a pointer to the object on which the method was called. Note
|
|
that the method name is mangled to encode the class name and argument
|
|
types. Name mangling is described in the <small>ARM</small> (<cite>The Annotated
|
|
C++ Reference Manual</cite>, by Ellis and Stroustrup, <small>ISBN</small>
|
|
0-201-51459-1); <samp>gpcompare.texi</samp> in Cygnus GCC distributions
|
|
describes the differences between GNU mangling and <small>ARM</small>
|
|
mangling.
|
|
</p>
|
|
<div class="example">
|
|
<pre class="example">.stabs "name:symbol_descriptor(global function)return_type(int)",
|
|
N_FUN, NIL, NIL, code_addr_of_method_start
|
|
|
|
.stabs "Ameth__5baseAic:F1",36,0,0,_Ameth__5baseAic
|
|
</pre></div>
|
|
|
|
<p>Here is the stab for the <code>this</code> pointer implicit argument. The
|
|
name of the <code>this</code> pointer is always <code>this</code>. Type 19, the
|
|
<code>this</code> pointer is defined as a pointer to type 20, <code>baseA</code>,
|
|
but a stab defining <code>baseA</code> has not yet been emitted. Since the
|
|
compiler knows it will be emitted shortly, here it just outputs a cross
|
|
reference to the undefined symbol, by prefixing the symbol name with
|
|
‘<samp>xs</samp>’.
|
|
</p>
|
|
<div class="example">
|
|
<pre class="example">.stabs "name:sym_desc(register param)type_def(19)=
|
|
type_desc(ptr to)type_ref(baseA)=
|
|
type_desc(cross-reference to)baseA:",N_RSYM,NIL,NIL,register_number
|
|
|
|
.stabs "this:P19=*20=xsbaseA:",64,0,0,8
|
|
</pre></div>
|
|
|
|
<p>The stab for the explicit integer argument looks just like a parameter
|
|
to a C function. The last field of the stab is the offset from the
|
|
argument pointer, which in most systems is the same as the frame
|
|
pointer.
|
|
</p>
|
|
<div class="example">
|
|
<pre class="example">.stabs "name:sym_desc(value parameter)type_ref(int)",
|
|
N_PSYM,NIL,NIL,offset_from_arg_ptr
|
|
|
|
.stabs "in:p1",160,0,0,72
|
|
</pre></div>
|
|
|
|
<p><< The examples that follow are based on A1.C >>
|
|
</p>
|
|
<hr>
|
|
<div class="header">
|
|
<p>
|
|
Next: <a href="Method-Type-Descriptor.html#Method-Type-Descriptor" accesskey="n" rel="next">Method Type Descriptor</a>, Previous: <a href="Class-Instance.html#Class-Instance" accesskey="p" rel="prev">Class Instance</a>, Up: <a href="Cplusplus.html#Cplusplus" accesskey="u" rel="up">Cplusplus</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>
|