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| author | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
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| committer | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
| commit | abdaadbcae30fe0c9a66c7516798279fdfd97750 (patch) | |
| tree | 00a54a6e25601e43876d03c1a4a12a749d4a914c /share/doc/gccint/Expression-trees.html | |
https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads
Change-Id: I7303388733328cd98ab9aa3c30236db67f2e9e9c
Diffstat (limited to 'share/doc/gccint/Expression-trees.html')
| -rw-r--r-- | share/doc/gccint/Expression-trees.html | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/share/doc/gccint/Expression-trees.html b/share/doc/gccint/Expression-trees.html new file mode 100644 index 0000000..1e43865 --- /dev/null +++ b/share/doc/gccint/Expression-trees.html @@ -0,0 +1,143 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- Copyright (C) 1988-2023 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 5.1, http://www.gnu.org/software/texinfo/ --> +<head> +<title>GNU Compiler Collection (GCC) Internals: Expression trees</title> + +<meta name="description" content="GNU Compiler Collection (GCC) Internals: Expression trees"> +<meta name="keywords" content="GNU Compiler Collection (GCC) Internals: Expression trees"> +<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="Constant-expressions.html#Constant-expressions" rel="next" title="Constant expressions"> +<link href="Attributes.html#Attributes" rel="previous" title="Attributes"> +<style type="text/css"> +<!-- +a.summary-letter {text-decoration: none} +blockquote.smallquotation {font-size: smaller} +div.display {margin-left: 3.2em} +div.example {margin-left: 3.2em} +div.indentedblock {margin-left: 3.2em} +div.lisp {margin-left: 3.2em} +div.smalldisplay {margin-left: 3.2em} +div.smallexample {margin-left: 3.2em} +div.smallindentedblock {margin-left: 3.2em; font-size: smaller} +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.nocodebreak {white-space:nowrap} +span.nolinebreak {white-space:nowrap} +span.roman {font-family:serif; font-weight:normal} +span.sansserif {font-family:sans-serif; font-weight:normal} +ul.no-bullet {list-style: none} +--> +</style> + + +</head> + +<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> +<a name="Expression-trees"></a> +<div class="header"> +<p> +Next: <a href="Statements.html#Statements" accesskey="n" rel="next">Statements</a>, Previous: <a href="Attributes.html#Attributes" accesskey="p" rel="previous">Attributes</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="Expressions-1"></a> +<h3 class="section">11.6 Expressions</h3> +<a name="index-expression"></a> +<a name="index-TREE_005fTYPE-3"></a> +<a name="index-TREE_005fOPERAND"></a> + +<p>The internal representation for expressions is for the most part quite +straightforward. However, there are a few facts that one must bear in +mind. In particular, the expression “tree” is actually a directed +acyclic graph. (For example there may be many references to the integer +constant zero throughout the source program; many of these will be +represented by the same expression node.) You should not rely on +certain kinds of node being shared, nor should you rely on certain kinds of +nodes being unshared. +</p> +<p>The following macros can be used with all expression nodes: +</p> +<dl compact="compact"> +<dt><code>TREE_TYPE</code> +<a name="index-TREE_005fTYPE-4"></a> +</dt> +<dd><p>Returns the type of the expression. This value may not be precisely the +same type that would be given the expression in the original program. +</p></dd> +</dl> + +<p>In what follows, some nodes that one might expect to always have type +<code>bool</code> are documented to have either integral or boolean type. At +some point in the future, the C front end may also make use of this same +intermediate representation, and at this point these nodes will +certainly have integral type. The previous sentence is not meant to +imply that the C++ front end does not or will not give these nodes +integral type. +</p> +<p>Below, we list the various kinds of expression nodes. Except where +noted otherwise, the operands to an expression are accessed using the +<code>TREE_OPERAND</code> macro. For example, to access the first operand to +a binary plus expression <code>expr</code>, use: +</p> +<div class="smallexample"> +<pre class="smallexample">TREE_OPERAND (expr, 0) +</pre></div> + +<p>As this example indicates, the operands are zero-indexed. +</p> + +<table class="menu" border="0" cellspacing="0"> +<tr><td align="left" valign="top">• <a href="Constant-expressions.html#Constant-expressions" accesskey="1">Constants</a>:</td><td> </td><td align="left" valign="top"> +</td></tr> +<tr><td align="left" valign="top">• <a href="Storage-References.html#Storage-References" accesskey="2">Storage References</a>:</td><td> </td><td align="left" valign="top"> +</td></tr> +<tr><td align="left" valign="top">• <a href="Unary-and-Binary-Expressions.html#Unary-and-Binary-Expressions" accesskey="3">Unary and Binary Expressions</a>:</td><td> </td><td align="left" valign="top"> +</td></tr> +<tr><td align="left" valign="top">• <a href="Vectors.html#Vectors" accesskey="4">Vectors</a>:</td><td> </td><td align="left" valign="top"> +</td></tr> +</table> + +<hr> +<div class="header"> +<p> +Next: <a href="Statements.html#Statements" accesskey="n" rel="next">Statements</a>, Previous: <a href="Attributes.html#Attributes" accesskey="p" rel="previous">Attributes</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> |