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147 lines
7.1 KiB
HTML
147 lines
7.1 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>Statement and operand traversals (GNU Compiler Collection (GCC) Internals)</title>
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<meta name="description" content="Statement and operand traversals (GNU Compiler Collection (GCC) Internals)">
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<meta name="keywords" content="Statement and operand traversals (GNU Compiler Collection (GCC) Internals)">
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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="GIMPLE.html#GIMPLE" rel="up" title="GIMPLE">
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<link href="Tree-SSA.html#Tree-SSA" rel="next" title="Tree SSA">
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<link href="Adding-a-new-GIMPLE-statement-code.html#Adding-a-new-GIMPLE-statement-code" rel="prev" title="Adding a new GIMPLE statement code">
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</style>
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</head>
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<body lang="en">
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<a name="Statement-and-operand-traversals"></a>
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<div class="header">
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<p>
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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>
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</div>
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<hr>
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<a name="Statement-and-operand-traversals-1"></a>
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<h3 class="section">12.12 Statement and operand traversals</h3>
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<a name="index-Statement-and-operand-traversals"></a>
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<p>There are two functions available for walking statements and
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sequences: <code>walk_gimple_stmt</code> and <code>walk_gimple_seq</code>,
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accordingly, and a third function for walking the operands in a
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statement: <code>walk_gimple_op</code>.
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</p>
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<dl>
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<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>
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<dd><p>This function is used to walk the current statement in <code>GSI</code>,
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optionally using traversal state stored in <code>WI</code>. If <code>WI</code> is <code>NULL</code>, no
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state is kept during the traversal.
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</p>
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<p>The callback <code>CALLBACK_STMT</code> is called. If <code>CALLBACK_STMT</code> returns
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true, it means that the callback function has handled all the
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operands of the statement and it is not necessary to walk its
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operands.
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</p>
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<p>If <code>CALLBACK_STMT</code> is <code>NULL</code> or it returns false, <code>CALLBACK_OP</code> is
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called on each operand of the statement via <code>walk_gimple_op</code>. If
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<code>walk_gimple_op</code> returns non-<code>NULL</code> for any operand, the remaining
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operands are not scanned.
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</p>
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<p>The return value is that returned by the last call to
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<code>walk_gimple_op</code>, or <code>NULL_TREE</code> if no <code>CALLBACK_OP</code> is specified.
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</p></dd></dl>
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<dl>
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<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>
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<dd><p>Use this function to walk the operands of statement <code>STMT</code>. Every
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operand is walked via <code>walk_tree</code> with optional state information
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in <code>WI</code>.
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</p>
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<p><code>CALLBACK_OP</code> is called on each operand of <code>STMT</code> via <code>walk_tree</code>.
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Additional parameters to <code>walk_tree</code> must be stored in <code>WI</code>. For
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each operand <code>OP</code>, <code>walk_tree</code> is called as:
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</p>
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<div class="smallexample">
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<pre class="smallexample">walk_tree (&<code>OP</code>, <code>CALLBACK_OP</code>, <code>WI</code>, <code>PSET</code>)
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</pre></div>
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<p>If <code>CALLBACK_OP</code> returns non-<code>NULL</code> for an operand, the remaining
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operands are not scanned. The return value is that returned by
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the last call to <code>walk_tree</code>, or <code>NULL_TREE</code> if no <code>CALLBACK_OP</code> is
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specified.
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</p></dd></dl>
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<dl>
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<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>
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<dd><p>This function walks all the statements in the sequence <code>SEQ</code>
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calling <code>walk_gimple_stmt</code> on each one. <code>WI</code> is as in
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<code>walk_gimple_stmt</code>. If <code>walk_gimple_stmt</code> returns non-<code>NULL</code>, the walk
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is stopped and the value returned. Otherwise, all the statements
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are walked and <code>NULL_TREE</code> returned.
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</p></dd></dl>
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<hr>
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<div class="header">
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<p>
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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>
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</div>
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</body>
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</html>
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