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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/Gimplification-pass.html | |
https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads
Change-Id: I7303388733328cd98ab9aa3c30236db67f2e9e9c
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diff --git a/share/doc/gccint/Gimplification-pass.html b/share/doc/gccint/Gimplification-pass.html new file mode 100644 index 0000000..97a6f4f --- /dev/null +++ b/share/doc/gccint/Gimplification-pass.html @@ -0,0 +1,125 @@ +<!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: Gimplification pass</title> + +<meta name="description" content="GNU Compiler Collection (GCC) Internals: Gimplification pass"> +<meta name="keywords" content="GNU Compiler Collection (GCC) Internals: Gimplification pass"> +<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="Pass-manager.html#Pass-manager" rel="next" title="Pass manager"> +<link href="Parsing-pass.html#Parsing-pass" rel="previous" title="Parsing 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="Gimplification-pass"></a> +<div class="header"> +<p> +Next: <a href="Pass-manager.html#Pass-manager" accesskey="n" rel="next">Pass manager</a>, Previous: <a href="Parsing-pass.html#Parsing-pass" accesskey="p" rel="previous">Parsing 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="Gimplification-pass-1"></a> +<h3 class="section">9.2 Gimplification pass</h3> + +<a name="index-gimplification-1"></a> +<a name="index-GIMPLE-1"></a> +<p><em>Gimplification</em> is a whimsical term for the process of converting +the intermediate representation of a function into the GIMPLE language +(see <a href="GIMPLE.html#GIMPLE">GIMPLE</a>). The term stuck, and so words like “gimplification”, +“gimplify”, “gimplifier” and the like are sprinkled throughout this +section of code. +</p> +<p>While a front end may certainly choose to generate GIMPLE directly if +it chooses, this can be a moderately complex process unless the +intermediate language used by the front end is already fairly simple. +Usually it is easier to generate GENERIC trees plus extensions +and let the language-independent gimplifier do most of the work. +</p> +<a name="index-gimplify_005ffunction_005ftree"></a> +<a name="index-gimplify_005fexpr"></a> +<a name="index-lang_005fhooks_002egimplify_005fexpr"></a> +<p>The main entry point to this pass is <code>gimplify_function_tree</code> +located in <samp>gimplify.cc</samp>. From here we process the entire +function gimplifying each statement in turn. The main workhorse +for this pass is <code>gimplify_expr</code>. Approximately everything +passes through here at least once, and it is from here that we +invoke the <code>lang_hooks.gimplify_expr</code> callback. +</p> +<p>The callback should examine the expression in question and return +<code>GS_UNHANDLED</code> if the expression is not a language specific +construct that requires attention. Otherwise it should alter the +expression in some way to such that forward progress is made toward +producing valid GIMPLE. If the callback is certain that the +transformation is complete and the expression is valid GIMPLE, it +should return <code>GS_ALL_DONE</code>. Otherwise it should return +<code>GS_OK</code>, which will cause the expression to be processed again. +If the callback encounters an error during the transformation (because +the front end is relying on the gimplification process to finish +semantic checks), it should return <code>GS_ERROR</code>. +</p> +<hr> +<div class="header"> +<p> +Next: <a href="Pass-manager.html#Pass-manager" accesskey="n" rel="next">Pass manager</a>, Previous: <a href="Parsing-pass.html#Parsing-pass" accesskey="p" rel="previous">Parsing 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> |