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.
145 lines
7.8 KiB
HTML
145 lines
7.8 KiB
HTML
4 years ago
|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||
|
|
<html>
|
||
|
|
<!-- Copyright (C) 1988-2018 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. -->
|
||
|
|
<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
|
||
|
|
<head>
|
||
|
|
<title>C and C++ Trees (GNU Compiler Collection (GCC) Internals)</title>
|
||
|
|
|
||
|
|
<meta name="description" content="C and C++ Trees (GNU Compiler Collection (GCC) Internals)">
|
||
|
|
<meta name="keywords" content="C and C++ Trees (GNU Compiler Collection (GCC) Internals)">
|
||
|
|
<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="Option-Index.html#Option-Index" rel="index" title="Option Index">
|
||
|
|
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
||
|
|
<link href="GENERIC.html#GENERIC" rel="up" title="GENERIC">
|
||
|
|
<link href="Types-for-C_002b_002b.html#Types-for-C_002b_002b" rel="next" title="Types for C++">
|
||
|
|
<link href="Language_002ddependent-trees.html#Language_002ddependent-trees" rel="prev" title="Language-dependent trees">
|
||
|
|
<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="C-and-C_002b_002b-Trees"></a>
|
||
|
|
<div class="header">
|
||
|
|
<p>
|
||
|
|
Next: <a href="Java-Trees.html#Java-Trees" accesskey="n" rel="next">Java Trees</a>, Previous: <a href="Language_002ddependent-trees.html#Language_002ddependent-trees" accesskey="p" rel="prev">Language-dependent trees</a>, Up: <a href="GENERIC.html#GENERIC" accesskey="u" rel="up">GENERIC</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
|
||
|
|
</div>
|
||
|
|
<hr>
|
||
|
|
<a name="C-and-C_002b_002b-Trees-1"></a>
|
||
|
|
<h3 class="section">11.10 C and C++ Trees</h3>
|
||
|
|
|
||
|
|
<p>This section documents the internal representation used by GCC to
|
||
|
|
represent C and C++ source programs. When presented with a C or C++
|
||
|
|
source program, GCC parses the program, performs semantic analysis
|
||
|
|
(including the generation of error messages), and then produces the
|
||
|
|
internal representation described here. This representation contains a
|
||
|
|
complete representation for the entire translation unit provided as
|
||
|
|
input to the front end. This representation is then typically processed
|
||
|
|
by a code-generator in order to produce machine code, but could also be
|
||
|
|
used in the creation of source browsers, intelligent editors, automatic
|
||
|
|
documentation generators, interpreters, and any other programs needing
|
||
|
|
the ability to process C or C++ code.
|
||
|
|
</p>
|
||
|
|
<p>This section explains the internal representation. In particular, it
|
||
|
|
documents the internal representation for C and C++ source
|
||
|
|
constructs, and the macros, functions, and variables that can be used to
|
||
|
|
access these constructs. The C++ representation is largely a superset
|
||
|
|
of the representation used in the C front end. There is only one
|
||
|
|
construct used in C that does not appear in the C++ front end and that
|
||
|
|
is the GNU “nested function” extension. Many of the macros documented
|
||
|
|
here do not apply in C because the corresponding language constructs do
|
||
|
|
not appear in C.
|
||
|
|
</p>
|
||
|
|
<p>The C and C++ front ends generate a mix of GENERIC trees and ones
|
||
|
|
specific to C and C++. These language-specific trees are higher-level
|
||
|
|
constructs than the ones in GENERIC to make the parser’s job easier.
|
||
|
|
This section describes those trees that aren’t part of GENERIC as well
|
||
|
|
as aspects of GENERIC trees that are treated in a language-specific
|
||
|
|
manner.
|
||
|
|
</p>
|
||
|
|
<p>If you are developing a “back end”, be it is a code-generator or some
|
||
|
|
other tool, that uses this representation, you may occasionally find
|
||
|
|
that you need to ask questions not easily answered by the functions and
|
||
|
|
macros available here. If that situation occurs, it is quite likely
|
||
|
|
that GCC already supports the functionality you desire, but that the
|
||
|
|
interface is simply not documented here. In that case, you should ask
|
||
|
|
the GCC maintainers (via mail to <a href="mailto:gcc@gcc.gnu.org">gcc@gcc.gnu.org</a>) about
|
||
|
|
documenting the functionality you require. Similarly, if you find
|
||
|
|
yourself writing functions that do not deal directly with your back end,
|
||
|
|
but instead might be useful to other people using the GCC front end, you
|
||
|
|
should submit your patches for inclusion in GCC.
|
||
|
|
</p>
|
||
|
|
<table class="menu" border="0" cellspacing="0">
|
||
|
|
<tr><td align="left" valign="top">• <a href="Types-for-C_002b_002b.html#Types-for-C_002b_002b" accesskey="1">Types for C++</a>:</td><td> </td><td align="left" valign="top">Fundamental and aggregate types.
|
||
|
|
</td></tr>
|
||
|
|
<tr><td align="left" valign="top">• <a href="Namespaces.html#Namespaces" accesskey="2">Namespaces</a>:</td><td> </td><td align="left" valign="top">Namespaces.
|
||
|
|
</td></tr>
|
||
|
|
<tr><td align="left" valign="top">• <a href="Classes.html#Classes" accesskey="3">Classes</a>:</td><td> </td><td align="left" valign="top">Classes.
|
||
|
|
</td></tr>
|
||
|
|
<tr><td align="left" valign="top">• <a href="Functions-for-C_002b_002b.html#Functions-for-C_002b_002b" accesskey="4">Functions for C++</a>:</td><td> </td><td align="left" valign="top">Overloading and accessors for C++.
|
||
|
|
</td></tr>
|
||
|
|
<tr><td align="left" valign="top">• <a href="Statements-for-C_002b_002b.html#Statements-for-C_002b_002b" accesskey="5">Statements for C++</a>:</td><td> </td><td align="left" valign="top">Statements specific to C and C++.
|
||
|
|
</td></tr>
|
||
|
|
<tr><td align="left" valign="top">• <a href="C_002b_002b-Expressions.html#C_002b_002b-Expressions" accesskey="6">C++ Expressions</a>:</td><td> </td><td align="left" valign="top">From <code>typeid</code> to <code>throw</code>.
|
||
|
|
</td></tr>
|
||
|
|
</table>
|
||
|
|
|
||
|
|
<hr>
|
||
|
|
<div class="header">
|
||
|
|
<p>
|
||
|
|
Next: <a href="Java-Trees.html#Java-Trees" accesskey="n" rel="next">Java Trees</a>, Previous: <a href="Language_002ddependent-trees.html#Language_002ddependent-trees" accesskey="p" rel="prev">Language-dependent trees</a>, Up: <a href="GENERIC.html#GENERIC" accesskey="u" rel="up">GENERIC</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
</body>
|
||
|
|
</html>
|