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339 lines
16 KiB
HTML
339 lines
16 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>Sequence iterators (GNU Compiler Collection (GCC) Internals)</title>
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<meta name="description" content="Sequence iterators (GNU Compiler Collection (GCC) Internals)">
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<meta name="keywords" content="Sequence iterators (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="GIMPLE.html#GIMPLE" rel="up" title="GIMPLE">
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<link href="Adding-a-new-GIMPLE-statement-code.html#Adding-a-new-GIMPLE-statement-code" rel="next" title="Adding a new GIMPLE statement code">
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<link href="GIMPLE-sequences.html#GIMPLE-sequences" rel="prev" title="GIMPLE sequences">
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</head>
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<body lang="en">
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<a name="Sequence-iterators"></a>
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<div class="header">
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<p>
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Next: <a href="Adding-a-new-GIMPLE-statement-code.html#Adding-a-new-GIMPLE-statement-code" accesskey="n" rel="next">Adding a new GIMPLE statement code</a>, Previous: <a href="GIMPLE-sequences.html#GIMPLE-sequences" accesskey="p" rel="prev">GIMPLE sequences</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="Sequence-iterators-1"></a>
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<h3 class="section">12.10 Sequence iterators</h3>
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<a name="index-Sequence-iterators"></a>
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<p>Sequence iterators are convenience constructs for iterating
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through statements in a sequence. Given a sequence <code>SEQ</code>, here is
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a typical use of gimple sequence iterators:
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</p>
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<div class="smallexample">
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<pre class="smallexample">gimple_stmt_iterator gsi;
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for (gsi = gsi_start (seq); !gsi_end_p (gsi); gsi_next (&gsi))
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{
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gimple g = gsi_stmt (gsi);
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/* Do something with gimple statement <code>G</code>. */
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}
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</pre></div>
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<p>Backward iterations are possible:
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</p>
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<div class="smallexample">
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<pre class="smallexample"> for (gsi = gsi_last (seq); !gsi_end_p (gsi); gsi_prev (&gsi))
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</pre></div>
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<p>Forward and backward iterations on basic blocks are possible with
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<code>gsi_start_bb</code> and <code>gsi_last_bb</code>.
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</p>
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<p>In the documentation below we sometimes refer to enum
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<code>gsi_iterator_update</code>. The valid options for this enumeration are:
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</p>
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<ul>
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<li> <code>GSI_NEW_STMT</code>
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Only valid when a single statement is added. Move the iterator to it.
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</li><li> <code>GSI_SAME_STMT</code>
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Leave the iterator at the same statement.
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</li><li> <code>GSI_CONTINUE_LINKING</code>
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Move iterator to whatever position is suitable for linking other
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statements in the same direction.
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</li></ul>
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<p>Below is a list of the functions used to manipulate and use
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statement iterators.
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</p>
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<dl>
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<dt><a name="index-gsi_005fstart"></a>GIMPLE function: <em>gimple_stmt_iterator</em> <strong>gsi_start</strong> <em>(gimple_seq seq)</em></dt>
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<dd><p>Return a new iterator pointing to the sequence <code>SEQ</code>’s first
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statement. If <code>SEQ</code> is empty, the iterator’s basic block is <code>NULL</code>.
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Use <code>gsi_start_bb</code> instead when the iterator needs to always have
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the correct basic block set.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gsi_005fstart_005fbb"></a>GIMPLE function: <em>gimple_stmt_iterator</em> <strong>gsi_start_bb</strong> <em>(basic_block bb)</em></dt>
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<dd><p>Return a new iterator pointing to the first statement in basic
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block <code>BB</code>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gsi_005flast"></a>GIMPLE function: <em>gimple_stmt_iterator</em> <strong>gsi_last</strong> <em>(gimple_seq seq)</em></dt>
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<dd><p>Return a new iterator initially pointing to the last statement of
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sequence <code>SEQ</code>. If <code>SEQ</code> is empty, the iterator’s basic block is
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<code>NULL</code>. Use <code>gsi_last_bb</code> instead when the iterator needs to always
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have the correct basic block set.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gsi_005flast_005fbb"></a>GIMPLE function: <em>gimple_stmt_iterator</em> <strong>gsi_last_bb</strong> <em>(basic_block bb)</em></dt>
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<dd><p>Return a new iterator pointing to the last statement in basic
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block <code>BB</code>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gsi_005fend_005fp"></a>GIMPLE function: <em>bool</em> <strong>gsi_end_p</strong> <em>(gimple_stmt_iterator i)</em></dt>
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<dd><p>Return <code>TRUE</code> if at the end of <code>I</code>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gsi_005fone_005fbefore_005fend_005fp"></a>GIMPLE function: <em>bool</em> <strong>gsi_one_before_end_p</strong> <em>(gimple_stmt_iterator i)</em></dt>
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<dd><p>Return <code>TRUE</code> if we’re one statement before the end of <code>I</code>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gsi_005fnext"></a>GIMPLE function: <em>void</em> <strong>gsi_next</strong> <em>(gimple_stmt_iterator *i)</em></dt>
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<dd><p>Advance the iterator to the next gimple statement.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gsi_005fprev"></a>GIMPLE function: <em>void</em> <strong>gsi_prev</strong> <em>(gimple_stmt_iterator *i)</em></dt>
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<dd><p>Advance the iterator to the previous gimple statement.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gsi_005fstmt"></a>GIMPLE function: <em>gimple</em> <strong>gsi_stmt</strong> <em>(gimple_stmt_iterator i)</em></dt>
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<dd><p>Return the current stmt.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gsi_005fafter_005flabels"></a>GIMPLE function: <em>gimple_stmt_iterator</em> <strong>gsi_after_labels</strong> <em>(basic_block bb)</em></dt>
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<dd><p>Return a block statement iterator that points to the first
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non-label statement in block <code>BB</code>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gsi_005fstmt_005fptr"></a>GIMPLE function: <em>gimple *</em> <strong>gsi_stmt_ptr</strong> <em>(gimple_stmt_iterator *i)</em></dt>
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<dd><p>Return a pointer to the current stmt.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gsi_005fbb"></a>GIMPLE function: <em>basic_block</em> <strong>gsi_bb</strong> <em>(gimple_stmt_iterator i)</em></dt>
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<dd><p>Return the basic block associated with this iterator.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gsi_005fseq"></a>GIMPLE function: <em>gimple_seq</em> <strong>gsi_seq</strong> <em>(gimple_stmt_iterator i)</em></dt>
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<dd><p>Return the sequence associated with this iterator.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gsi_005fremove"></a>GIMPLE function: <em>void</em> <strong>gsi_remove</strong> <em>(gimple_stmt_iterator *i, bool remove_eh_info)</em></dt>
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<dd><p>Remove the current stmt from the sequence. The iterator is
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updated to point to the next statement. When <code>REMOVE_EH_INFO</code> is
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true we remove the statement pointed to by iterator <code>I</code> from the <code>EH</code>
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tables. Otherwise we do not modify the <code>EH</code> tables. Generally,
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<code>REMOVE_EH_INFO</code> should be true when the statement is going to be
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removed from the <code>IL</code> and not reinserted elsewhere.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gsi_005flink_005fseq_005fbefore"></a>GIMPLE function: <em>void</em> <strong>gsi_link_seq_before</strong> <em>(gimple_stmt_iterator *i, gimple_seq seq, enum gsi_iterator_update mode)</em></dt>
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<dd><p>Links the sequence of statements <code>SEQ</code> before the statement pointed
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by iterator <code>I</code>. <code>MODE</code> indicates what to do with the iterator
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after insertion (see <code>enum gsi_iterator_update</code> above).
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</p></dd></dl>
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<dl>
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<dt><a name="index-gsi_005flink_005fbefore"></a>GIMPLE function: <em>void</em> <strong>gsi_link_before</strong> <em>(gimple_stmt_iterator *i, gimple g, enum gsi_iterator_update mode)</em></dt>
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<dd><p>Links statement <code>G</code> before the statement pointed-to by iterator <code>I</code>.
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Updates iterator <code>I</code> according to <code>MODE</code>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gsi_005flink_005fseq_005fafter"></a>GIMPLE function: <em>void</em> <strong>gsi_link_seq_after</strong> <em>(gimple_stmt_iterator *i, gimple_seq seq, enum gsi_iterator_update mode)</em></dt>
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<dd><p>Links sequence <code>SEQ</code> after the statement pointed-to by iterator <code>I</code>.
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<code>MODE</code> is as in <code>gsi_insert_after</code>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gsi_005flink_005fafter"></a>GIMPLE function: <em>void</em> <strong>gsi_link_after</strong> <em>(gimple_stmt_iterator *i, gimple g, enum gsi_iterator_update mode)</em></dt>
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<dd><p>Links statement <code>G</code> after the statement pointed-to by iterator <code>I</code>.
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<code>MODE</code> is as in <code>gsi_insert_after</code>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gsi_005fsplit_005fseq_005fafter"></a>GIMPLE function: <em>gimple_seq</em> <strong>gsi_split_seq_after</strong> <em>(gimple_stmt_iterator i)</em></dt>
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<dd><p>Move all statements in the sequence after <code>I</code> to a new sequence.
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Return this new sequence.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gsi_005fsplit_005fseq_005fbefore"></a>GIMPLE function: <em>gimple_seq</em> <strong>gsi_split_seq_before</strong> <em>(gimple_stmt_iterator *i)</em></dt>
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<dd><p>Move all statements in the sequence before <code>I</code> to a new sequence.
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Return this new sequence.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gsi_005freplace"></a>GIMPLE function: <em>void</em> <strong>gsi_replace</strong> <em>(gimple_stmt_iterator *i, gimple stmt, bool update_eh_info)</em></dt>
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<dd><p>Replace the statement pointed-to by <code>I</code> to <code>STMT</code>. If <code>UPDATE_EH_INFO</code>
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is true, the exception handling information of the original
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statement is moved to the new statement.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gsi_005finsert_005fbefore"></a>GIMPLE function: <em>void</em> <strong>gsi_insert_before</strong> <em>(gimple_stmt_iterator *i, gimple stmt, enum gsi_iterator_update mode)</em></dt>
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<dd><p>Insert statement <code>STMT</code> before the statement pointed-to by iterator
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<code>I</code>, update <code>STMT</code>’s basic block and scan it for new operands. <code>MODE</code>
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specifies how to update iterator <code>I</code> after insertion (see enum
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<code>gsi_iterator_update</code>).
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</p></dd></dl>
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<dl>
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<dt><a name="index-gsi_005finsert_005fseq_005fbefore"></a>GIMPLE function: <em>void</em> <strong>gsi_insert_seq_before</strong> <em>(gimple_stmt_iterator *i, gimple_seq seq, enum gsi_iterator_update mode)</em></dt>
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<dd><p>Like <code>gsi_insert_before</code>, but for all the statements in <code>SEQ</code>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gsi_005finsert_005fafter"></a>GIMPLE function: <em>void</em> <strong>gsi_insert_after</strong> <em>(gimple_stmt_iterator *i, gimple stmt, enum gsi_iterator_update mode)</em></dt>
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<dd><p>Insert statement <code>STMT</code> after the statement pointed-to by iterator
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<code>I</code>, update <code>STMT</code>’s basic block and scan it for new operands. <code>MODE</code>
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specifies how to update iterator <code>I</code> after insertion (see enum
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<code>gsi_iterator_update</code>).
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</p></dd></dl>
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<dl>
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<dt><a name="index-gsi_005finsert_005fseq_005fafter"></a>GIMPLE function: <em>void</em> <strong>gsi_insert_seq_after</strong> <em>(gimple_stmt_iterator *i, gimple_seq seq, enum gsi_iterator_update mode)</em></dt>
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<dd><p>Like <code>gsi_insert_after</code>, but for all the statements in <code>SEQ</code>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gsi_005ffor_005fstmt"></a>GIMPLE function: <em>gimple_stmt_iterator</em> <strong>gsi_for_stmt</strong> <em>(gimple stmt)</em></dt>
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<dd><p>Finds iterator for <code>STMT</code>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gsi_005fmove_005fafter"></a>GIMPLE function: <em>void</em> <strong>gsi_move_after</strong> <em>(gimple_stmt_iterator *from, gimple_stmt_iterator *to)</em></dt>
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<dd><p>Move the statement at <code>FROM</code> so it comes right after the statement
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at <code>TO</code>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gsi_005fmove_005fbefore"></a>GIMPLE function: <em>void</em> <strong>gsi_move_before</strong> <em>(gimple_stmt_iterator *from, gimple_stmt_iterator *to)</em></dt>
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<dd><p>Move the statement at <code>FROM</code> so it comes right before the statement
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at <code>TO</code>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gsi_005fmove_005fto_005fbb_005fend"></a>GIMPLE function: <em>void</em> <strong>gsi_move_to_bb_end</strong> <em>(gimple_stmt_iterator *from, basic_block bb)</em></dt>
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<dd><p>Move the statement at <code>FROM</code> to the end of basic block <code>BB</code>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gsi_005finsert_005fon_005fedge"></a>GIMPLE function: <em>void</em> <strong>gsi_insert_on_edge</strong> <em>(edge e, gimple stmt)</em></dt>
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<dd><p>Add <code>STMT</code> to the pending list of edge <code>E</code>. No actual insertion is
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made until a call to <code>gsi_commit_edge_inserts</code>() is made.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gsi_005finsert_005fseq_005fon_005fedge"></a>GIMPLE function: <em>void</em> <strong>gsi_insert_seq_on_edge</strong> <em>(edge e, gimple_seq seq)</em></dt>
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<dd><p>Add the sequence of statements in <code>SEQ</code> to the pending list of edge
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<code>E</code>. No actual insertion is made until a call to
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<code>gsi_commit_edge_inserts</code>() is made.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gsi_005finsert_005fon_005fedge_005fimmediate"></a>GIMPLE function: <em>basic_block</em> <strong>gsi_insert_on_edge_immediate</strong> <em>(edge e, gimple stmt)</em></dt>
|
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<dd><p>Similar to <code>gsi_insert_on_edge</code>+<code>gsi_commit_edge_inserts</code>. If a new
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block has to be created, it is returned.
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</p></dd></dl>
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||
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<dl>
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<dt><a name="index-gsi_005fcommit_005fone_005fedge_005finsert"></a>GIMPLE function: <em>void</em> <strong>gsi_commit_one_edge_insert</strong> <em>(edge e, basic_block *new_bb)</em></dt>
|
||
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|
<dd><p>Commit insertions pending at edge <code>E</code>. If a new block is created,
|
||
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set <code>NEW_BB</code> to this block, otherwise set it to <code>NULL</code>.
|
||
|
|
</p></dd></dl>
|
||
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<dl>
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<dt><a name="index-gsi_005fcommit_005fedge_005finserts"></a>GIMPLE function: <em>void</em> <strong>gsi_commit_edge_inserts</strong> <em>(void)</em></dt>
|
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<dd><p>This routine will commit all pending edge insertions, creating
|
||
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|
any new basic blocks which are necessary.
|
||
|
|
</p></dd></dl>
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||
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<hr>
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<div class="header">
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<p>
|
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Next: <a href="Adding-a-new-GIMPLE-statement-code.html#Adding-a-new-GIMPLE-statement-code" accesskey="n" rel="next">Adding a new GIMPLE statement code</a>, Previous: <a href="GIMPLE-sequences.html#GIMPLE-sequences" accesskey="p" rel="prev">GIMPLE sequences</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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