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101 lines
4.3 KiB
HTML
101 lines
4.3 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2018 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Funding Free Software", the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Language-dependent trees (GNU Compiler Collection (GCC) Internals)</title>
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<meta name="description" content="Language-dependent trees (GNU Compiler Collection (GCC) Internals)">
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<meta name="keywords" content="Language-dependent trees (GNU Compiler Collection (GCC) Internals)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="GENERIC.html#GENERIC" rel="up" title="GENERIC">
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<link href="C-and-C_002b_002b-Trees.html#C-and-C_002b_002b-Trees" rel="next" title="C and C++ Trees">
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<link href="Function-Properties.html#Function-Properties" rel="prev" title="Function Properties">
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<style type="text/css">
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Language_002ddependent-trees"></a>
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<div class="header">
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<p>
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Next: <a href="C-and-C_002b_002b-Trees.html#C-and-C_002b_002b-Trees" accesskey="n" rel="next">C and C++ Trees</a>, Previous: <a href="Functions.html#Functions" accesskey="p" rel="prev">Functions</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>
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</div>
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<hr>
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<a name="Language_002ddependent-trees-1"></a>
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<h3 class="section">11.9 Language-dependent trees</h3>
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<a name="index-language_002ddependent-trees"></a>
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<p>Front ends may wish to keep some state associated with various GENERIC
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trees while parsing. To support this, trees provide a set of flags
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that may be used by the front end. They are accessed using
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<code>TREE_LANG_FLAG_n</code> where ‘<samp>n</samp>’ is currently 0 through 6.
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</p>
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<p>If necessary, a front end can use some language-dependent tree
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codes in its GENERIC representation, so long as it provides a
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hook for converting them to GIMPLE and doesn’t expect them to
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work with any (hypothetical) optimizers that run before the
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conversion to GIMPLE. The intermediate representation used while
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parsing C and C++ looks very little like GENERIC, but the C and
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C++ gimplifier hooks are perfectly happy to take it as input and
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spit out GIMPLE.
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</p>
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</body>
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</html>
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