148 lines
7.2 KiB
HTML
148 lines
7.2 KiB
HTML
|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||
|
|
<html>
|
||
|
|
<!-- Copyright (C) 1988-2016 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 5.2, http://www.gnu.org/software/texinfo/ -->
|
||
|
|
<head>
|
||
|
|
<title>GNU Compiler Collection (GCC) Internals: Statement and operand traversals</title>
|
||
|
|
|
||
|
|
<meta name="description" content="GNU Compiler Collection (GCC) Internals: Statement and operand traversals">
|
||
|
|
<meta name="keywords" content="GNU Compiler Collection (GCC) Internals: Statement and operand traversals">
|
||
|
|
<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="GIMPLE.html#GIMPLE" rel="up" title="GIMPLE">
|
||
|
|
<link href="Tree-SSA.html#Tree-SSA" rel="next" title="Tree SSA">
|
||
|
|
<link href="Adding-a-new-GIMPLE-statement-code.html#Adding-a-new-GIMPLE-statement-code" rel="prev" title="Adding a new GIMPLE statement code">
|
||
|
|
<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="Statement-and-operand-traversals"></a>
|
||
|
|
<div class="header">
|
||
|
|
<p>
|
||
|
|
Previous: <a href="Adding-a-new-GIMPLE-statement-code.html#Adding-a-new-GIMPLE-statement-code" accesskey="p" rel="prev">Adding a new GIMPLE statement code</a>, Up: <a href="GIMPLE.html#GIMPLE" accesskey="u" rel="up">GIMPLE</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="Statement-and-operand-traversals-1"></a>
|
||
|
|
<h3 class="section">11.12 Statement and operand traversals</h3>
|
||
|
|
<a name="index-Statement-and-operand-traversals"></a>
|
||
|
|
|
||
|
|
<p>There are two functions available for walking statements and
|
||
|
|
sequences: <code>walk_gimple_stmt</code> and <code>walk_gimple_seq</code>,
|
||
|
|
accordingly, and a third function for walking the operands in a
|
||
|
|
statement: <code>walk_gimple_op</code>.
|
||
|
|
</p>
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-walk_005fgimple_005fstmt"></a>GIMPLE function: <em>tree</em> <strong>walk_gimple_stmt</strong> <em>(gimple_stmt_iterator *gsi, walk_stmt_fn callback_stmt, walk_tree_fn callback_op, struct walk_stmt_info *wi)</em></dt>
|
||
|
|
<dd><p>This function is used to walk the current statement in <code>GSI</code>,
|
||
|
|
optionally using traversal state stored in <code>WI</code>. If <code>WI</code> is <code>NULL</code>, no
|
||
|
|
state is kept during the traversal.
|
||
|
|
</p>
|
||
|
|
<p>The callback <code>CALLBACK_STMT</code> is called. If <code>CALLBACK_STMT</code> returns
|
||
|
|
true, it means that the callback function has handled all the
|
||
|
|
operands of the statement and it is not necessary to walk its
|
||
|
|
operands.
|
||
|
|
</p>
|
||
|
|
<p>If <code>CALLBACK_STMT</code> is <code>NULL</code> or it returns false, <code>CALLBACK_OP</code> is
|
||
|
|
called on each operand of the statement via <code>walk_gimple_op</code>. If
|
||
|
|
<code>walk_gimple_op</code> returns non-<code>NULL</code> for any operand, the remaining
|
||
|
|
operands are not scanned.
|
||
|
|
</p>
|
||
|
|
<p>The return value is that returned by the last call to
|
||
|
|
<code>walk_gimple_op</code>, or <code>NULL_TREE</code> if no <code>CALLBACK_OP</code> is specified.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-walk_005fgimple_005fop"></a>GIMPLE function: <em>tree</em> <strong>walk_gimple_op</strong> <em>(gimple stmt, walk_tree_fn callback_op, struct walk_stmt_info *wi)</em></dt>
|
||
|
|
<dd><p>Use this function to walk the operands of statement <code>STMT</code>. Every
|
||
|
|
operand is walked via <code>walk_tree</code> with optional state information
|
||
|
|
in <code>WI</code>.
|
||
|
|
</p>
|
||
|
|
<p><code>CALLBACK_OP</code> is called on each operand of <code>STMT</code> via <code>walk_tree</code>.
|
||
|
|
Additional parameters to <code>walk_tree</code> must be stored in <code>WI</code>. For
|
||
|
|
each operand <code>OP</code>, <code>walk_tree</code> is called as:
|
||
|
|
</p>
|
||
|
|
<div class="smallexample">
|
||
|
|
<pre class="smallexample">walk_tree (&<code>OP</code>, <code>CALLBACK_OP</code>, <code>WI</code>, <code>PSET</code>)
|
||
|
|
</pre></div>
|
||
|
|
|
||
|
|
<p>If <code>CALLBACK_OP</code> returns non-<code>NULL</code> for an operand, the remaining
|
||
|
|
operands are not scanned. The return value is that returned by
|
||
|
|
the last call to <code>walk_tree</code>, or <code>NULL_TREE</code> if no <code>CALLBACK_OP</code> is
|
||
|
|
specified.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-walk_005fgimple_005fseq"></a>GIMPLE function: <em>tree</em> <strong>walk_gimple_seq</strong> <em>(gimple_seq seq, walk_stmt_fn callback_stmt, walk_tree_fn callback_op, struct walk_stmt_info *wi)</em></dt>
|
||
|
|
<dd><p>This function walks all the statements in the sequence <code>SEQ</code>
|
||
|
|
calling <code>walk_gimple_stmt</code> on each one. <code>WI</code> is as in
|
||
|
|
<code>walk_gimple_stmt</code>. If <code>walk_gimple_stmt</code> returns non-<code>NULL</code>, the walk
|
||
|
|
is stopped and the value returned. Otherwise, all the statements
|
||
|
|
are walked and <code>NULL_TREE</code> returned.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
|
||
|
|
<hr>
|
||
|
|
<div class="header">
|
||
|
|
<p>
|
||
|
|
Previous: <a href="Adding-a-new-GIMPLE-statement-code.html#Adding-a-new-GIMPLE-statement-code" accesskey="p" rel="prev">Adding a new GIMPLE statement code</a>, Up: <a href="GIMPLE.html#GIMPLE" accesskey="u" rel="up">GIMPLE</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>
|