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| author | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
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| committer | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
| commit | abdaadbcae30fe0c9a66c7516798279fdfd97750 (patch) | |
| tree | 00a54a6e25601e43876d03c1a4a12a749d4a914c /share/doc/gccint/Pass-manager.html | |
https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads
Change-Id: I7303388733328cd98ab9aa3c30236db67f2e9e9c
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| -rw-r--r-- | share/doc/gccint/Pass-manager.html | 122 |
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diff --git a/share/doc/gccint/Pass-manager.html b/share/doc/gccint/Pass-manager.html new file mode 100644 index 0000000..df12ebd --- /dev/null +++ b/share/doc/gccint/Pass-manager.html @@ -0,0 +1,122 @@ +<!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: Pass manager</title> + +<meta name="description" content="GNU Compiler Collection (GCC) Internals: Pass manager"> +<meta name="keywords" content="GNU Compiler Collection (GCC) Internals: Pass manager"> +<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="Passes.html#Passes" rel="up" title="Passes"> +<link href="IPA-passes.html#IPA-passes" rel="next" title="IPA passes"> +<link href="Gimplification-pass.html#Gimplification-pass" rel="previous" title="Gimplification pass"> +<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="Pass-manager"></a> +<div class="header"> +<p> +Next: <a href="IPA-passes.html#IPA-passes" accesskey="n" rel="next">IPA passes</a>, Previous: <a href="Gimplification-pass.html#Gimplification-pass" accesskey="p" rel="previous">Gimplification pass</a>, Up: <a href="Passes.html#Passes" accesskey="u" rel="up">Passes</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="Pass-manager-1"></a> +<h3 class="section">9.3 Pass manager</h3> + +<p>The pass manager is located in <samp>passes.cc</samp>, <samp>tree-optimize.c</samp> +and <samp>tree-pass.h</samp>. +It processes passes as described in <samp>passes.def</samp>. +Its job is to run all of the individual passes in the correct order, +and take care of standard bookkeeping that applies to every pass. +</p> +<p>The theory of operation is that each pass defines a structure that +represents everything we need to know about that pass—when it +should be run, how it should be run, what intermediate language +form or on-the-side data structures it needs. We register the pass +to be run in some particular order, and the pass manager arranges +for everything to happen in the correct order. +</p> +<p>The actuality doesn’t completely live up to the theory at present. +Command-line switches and <code>timevar_id_t</code> enumerations must still +be defined elsewhere. The pass manager validates constraints but does +not attempt to (re-)generate data structures or lower intermediate +language form based on the requirements of the next pass. Nevertheless, +what is present is useful, and a far sight better than nothing at all. +</p> +<p>Each pass should have a unique name. +Each pass may have its own dump file (for GCC debugging purposes). +Passes with a name starting with a star do not dump anything. +Sometimes passes are supposed to share a dump file / option name. +To still give these unique names, you can use a prefix that is delimited +by a space from the part that is used for the dump file / option name. +E.g. When the pass name is "ud dce", the name used for dump file/options +is "dce". +</p> +<p>TODO: describe the global variables set up by the pass manager, +and a brief description of how a new pass should use it. +I need to look at what info RTL passes use first<small class="enddots">...</small> +</p> +<hr> +<div class="header"> +<p> +Next: <a href="IPA-passes.html#IPA-passes" accesskey="n" rel="next">IPA passes</a>, Previous: <a href="Gimplification-pass.html#Gimplification-pass" accesskey="p" rel="previous">Gimplification pass</a>, Up: <a href="Passes.html#Passes" accesskey="u" rel="up">Passes</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> |