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diff --git a/share/doc/gccint/Statement-and-operand-traversals.html b/share/doc/gccint/Statement-and-operand-traversals.html new file mode 100644 index 0000000..3fad537 --- /dev/null +++ b/share/doc/gccint/Statement-and-operand-traversals.html @@ -0,0 +1,147 @@ +<!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: 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="previous" 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="previous">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">12.12 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="previous">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> |