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.
97 lines
4.5 KiB
HTML
97 lines
4.5 KiB
HTML
4 years ago
|
<html lang="en">
|
||
|
|
<head>
|
||
|
|
<title>Identifiers - GNU Compiler Collection (GCC) Internals</title>
|
||
|
|
<meta http-equiv="Content-Type" content="text/html">
|
||
|
|
<meta name="description" content="GNU Compiler Collection (GCC) Internals">
|
||
|
|
<meta name="generator" content="makeinfo 4.13">
|
||
|
|
<link title="Top" rel="start" href="index.html#Top">
|
||
|
|
<link rel="up" href="Tree-overview.html#Tree-overview" title="Tree overview">
|
||
|
|
<link rel="prev" href="Macros-and-Functions.html#Macros-and-Functions" title="Macros and Functions">
|
||
|
|
<link rel="next" href="Containers.html#Containers" title="Containers">
|
||
|
|
<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
|
||
|
|
<!--
|
||
|
|
Copyright (C) 1988-2015 Free Software Foundation, Inc.
|
||
|
|
|
||
|
|
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 the
|
||
|
|
Invariant Sections being ``Funding Free Software'', the Front-Cover
|
||
|
|
Texts being (a) (see below), and with the Back-Cover Texts being (b)
|
||
|
|
(see below). A copy of the license is included in the section entitled
|
||
|
|
``GNU Free Documentation License''.
|
||
|
|
|
||
|
|
(a) The FSF's Front-Cover Text is:
|
||
|
|
|
||
|
|
A GNU Manual
|
||
|
|
|
||
|
|
(b) The FSF's Back-Cover Text is:
|
||
|
|
|
||
|
|
You have freedom to copy and modify this GNU Manual, like GNU
|
||
|
|
software. Copies published by the Free Software Foundation raise
|
||
|
|
funds for GNU development.-->
|
||
|
|
<meta http-equiv="Content-Style-Type" content="text/css">
|
||
|
|
<style type="text/css"><!--
|
||
|
|
pre.display { font-family:inherit }
|
||
|
|
pre.format { font-family:inherit }
|
||
|
|
pre.smalldisplay { font-family:inherit; font-size:smaller }
|
||
|
|
pre.smallformat { font-family:inherit; font-size:smaller }
|
||
|
|
pre.smallexample { font-size:smaller }
|
||
|
|
pre.smalllisp { font-size:smaller }
|
||
|
|
span.sc { font-variant:small-caps }
|
||
|
|
span.roman { font-family:serif; font-weight:normal; }
|
||
|
|
span.sansserif { font-family:sans-serif; font-weight:normal; }
|
||
|
|
--></style>
|
||
|
|
</head>
|
||
|
|
<body>
|
||
|
|
<div class="node">
|
||
|
|
<a name="Identifiers"></a>
|
||
|
|
<p>
|
||
|
|
Next: <a rel="next" accesskey="n" href="Containers.html#Containers">Containers</a>,
|
||
|
|
Previous: <a rel="previous" accesskey="p" href="Macros-and-Functions.html#Macros-and-Functions">Macros and Functions</a>,
|
||
|
|
Up: <a rel="up" accesskey="u" href="Tree-overview.html#Tree-overview">Tree overview</a>
|
||
|
|
<hr>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<h4 class="subsection">10.2.2 Identifiers</h4>
|
||
|
|
|
||
|
|
<p><a name="index-identifier-1726"></a><a name="index-name-1727"></a><a name="index-IDENTIFIER_005fNODE-1728"></a>
|
||
|
|
An <code>IDENTIFIER_NODE</code> represents a slightly more general concept
|
||
|
|
than the standard C or C++ concept of identifier. In particular, an
|
||
|
|
<code>IDENTIFIER_NODE</code> may contain a ‘<samp><span class="samp">$</span></samp>’, or other extraordinary
|
||
|
|
characters.
|
||
|
|
|
||
|
|
<p>There are never two distinct <code>IDENTIFIER_NODE</code>s representing the
|
||
|
|
same identifier. Therefore, you may use pointer equality to compare
|
||
|
|
<code>IDENTIFIER_NODE</code>s, rather than using a routine like
|
||
|
|
<code>strcmp</code>. Use <code>get_identifier</code> to obtain the unique
|
||
|
|
<code>IDENTIFIER_NODE</code> for a supplied string.
|
||
|
|
|
||
|
|
<p>You can use the following macros to access identifiers:
|
||
|
|
<dl>
|
||
|
|
<dt><code>IDENTIFIER_POINTER</code><a name="index-IDENTIFIER_005fPOINTER-1729"></a><dd>The string represented by the identifier, represented as a
|
||
|
|
<code>char*</code>. This string is always <code>NUL</code>-terminated, and contains
|
||
|
|
no embedded <code>NUL</code> characters.
|
||
|
|
|
||
|
|
<br><dt><code>IDENTIFIER_LENGTH</code><a name="index-IDENTIFIER_005fLENGTH-1730"></a><dd>The length of the string returned by <code>IDENTIFIER_POINTER</code>, not
|
||
|
|
including the trailing <code>NUL</code>. This value of
|
||
|
|
<code>IDENTIFIER_LENGTH (x)</code> is always the same as <code>strlen
|
||
|
|
(IDENTIFIER_POINTER (x))</code>.
|
||
|
|
|
||
|
|
<br><dt><code>IDENTIFIER_OPNAME_P</code><a name="index-IDENTIFIER_005fOPNAME_005fP-1731"></a><dd>This predicate holds if the identifier represents the name of an
|
||
|
|
overloaded operator. In this case, you should not depend on the
|
||
|
|
contents of either the <code>IDENTIFIER_POINTER</code> or the
|
||
|
|
<code>IDENTIFIER_LENGTH</code>.
|
||
|
|
|
||
|
|
<br><dt><code>IDENTIFIER_TYPENAME_P</code><a name="index-IDENTIFIER_005fTYPENAME_005fP-1732"></a><dd>This predicate holds if the identifier represents the name of a
|
||
|
|
user-defined conversion operator. In this case, the <code>TREE_TYPE</code> of
|
||
|
|
the <code>IDENTIFIER_NODE</code> holds the type to which the conversion
|
||
|
|
operator converts.
|
||
|
|
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<!-- -->
|
||
|
|
<!-- Containers -->
|
||
|
|
<!-- -->
|
||
|
|
</body></html>
|
||
|
|
|