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74 lines
3.0 KiB
HTML
74 lines
3.0 KiB
HTML
4 years ago
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<title>Jumps - GNU Compiler Collection (GCC) Internals</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="GNU Compiler Collection (GCC) Internals">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Statements.html#Statements" title="Statements">
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<link rel="prev" href="Empty-Statements.html#Empty-Statements" title="Empty Statements">
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<link rel="next" href="Cleanups.html#Cleanups" title="Cleanups">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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Copyright (C) 1988-2015 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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--></style>
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</head>
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<body>
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<div class="node">
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<a name="Jumps"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Cleanups.html#Cleanups">Cleanups</a>,
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Previous: <a rel="previous" accesskey="p" href="Empty-Statements.html#Empty-Statements">Empty Statements</a>,
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Up: <a rel="up" accesskey="u" href="Statements.html#Statements">Statements</a>
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<hr>
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</div>
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<h4 class="subsection">10.7.5 Jumps</h4>
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<p><a name="index-Jumps-1941"></a>
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Other jumps are expressed by either <code>GOTO_EXPR</code> or
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<code>RETURN_EXPR</code>.
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<p>The operand of a <code>GOTO_EXPR</code> must be either a label or a
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variable containing the address to jump to.
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<p>The operand of a <code>RETURN_EXPR</code> is either <code>NULL_TREE</code>,
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<code>RESULT_DECL</code>, or a <code>MODIFY_EXPR</code> which sets the return
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value. It would be nice to move the <code>MODIFY_EXPR</code> into a
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separate statement, but the special return semantics in
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<code>expand_return</code> make that difficult. It may still happen in
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the future, perhaps by moving most of that logic into
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<code>expand_assignment</code>.
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</body></html>
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