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123 lines
4.7 KiB
HTML
123 lines
4.7 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>RTL Tests (GNU Compiler Collection (GCC) Internals)</title>
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<meta name="description" content="RTL Tests (GNU Compiler Collection (GCC) Internals)">
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<meta name="keywords" content="RTL Tests (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="Testsuites.html#Testsuites" rel="up" title="Testsuites">
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<link href="Options.html#Options" rel="next" title="Options">
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<link href="GIMPLE-Tests.html#GIMPLE-Tests" rel="prev" title="GIMPLE Tests">
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<style type="text/css">
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a.summary-letter {text-decoration: none}
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blockquote.indentedblock {margin-right: 0em}
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blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
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div.display {margin-left: 3.2em}
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div.example {margin-left: 3.2em}
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div.lisp {margin-left: 3.2em}
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div.smalldisplay {margin-left: 3.2em}
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kbd {font-style: oblique}
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pre.display {font-family: inherit}
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pre.format {font-family: inherit}
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pre.menu-comment {font-family: serif}
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pre.menu-preformatted {font-family: serif}
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pre.smalldisplay {font-family: inherit; font-size: smaller}
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pre.smallexample {font-size: smaller}
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pre.smalllisp {font-size: smaller}
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span.nolinebreak {white-space: nowrap}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="RTL-Tests"></a>
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<div class="header">
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<p>
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Previous: <a href="GIMPLE-Tests.html#GIMPLE-Tests" accesskey="p" rel="prev">GIMPLE Tests</a>, Up: <a href="Testsuites.html#Testsuites" accesskey="u" rel="up">Testsuites</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="Support-for-testing-RTL-passes"></a>
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<h3 class="section">7.11 Support for testing RTL passes</h3>
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<p>As of gcc 7, C functions can be tagged with <code>__RTL</code> to indicate that the
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function body will be RTL, rather than C. For example:
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</p>
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<div class="smallexample">
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<pre class="smallexample">double __RTL (startwith ("ira")) test (struct foo *f, const struct bar *b)
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{
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(function "test"
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[...snip; various directives go in here...]
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) ;; function "test"
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}
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</pre></div>
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<p>The <code>startwith</code> argument indicates at which pass to begin.
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</p>
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<p>The parser expects the RTL body to be in the format emitted by this
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dumping function:
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</p>
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<div class="smallexample">
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<pre class="smallexample">DEBUG_FUNCTION void
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print_rtx_function (FILE *outfile, function *fn, bool compact);
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</pre></div>
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<p>when "compact" is true. So you can capture RTL in the correct format
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from the debugger using:
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</p>
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<div class="smallexample">
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<pre class="smallexample">(gdb) print_rtx_function (stderr, cfun, true);
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</pre></div>
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<p>and copy and paste the output into the body of the C function.
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</p>
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<p>Example DejaGnu tests of RTL can be seen in the source tree under
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<samp>gcc/testsuite/gcc.dg/rtl</samp>.
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</p>
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<p>The <code>__RTL</code> parser is not integrated with the C tokenizer or
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preprocessor, and works simply by reading the relevant lines within
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the braces. In particular, the RTL body must be on separate lines from
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the enclosing braces, and the preprocessor is not usable within it.
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</p>
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</body>
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</html>
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