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diff --git a/share/doc/gccint/Host-Common.html b/share/doc/gccint/Host-Common.html new file mode 100644 index 0000000..553ae00 --- /dev/null +++ b/share/doc/gccint/Host-Common.html @@ -0,0 +1,141 @@ +<!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: Host Common</title> + +<meta name="description" content="GNU Compiler Collection (GCC) Internals: Host Common"> +<meta name="keywords" content="GNU Compiler Collection (GCC) Internals: Host Common"> +<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="Host-Config.html#Host-Config" rel="up" title="Host Config"> +<link href="Filesystem.html#Filesystem" rel="next" title="Filesystem"> +<link href="Host-Config.html#Host-Config" rel="previous" title="Host Config"> +<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="Host-Common"></a> +<div class="header"> +<p> +Next: <a href="Filesystem.html#Filesystem" accesskey="n" rel="next">Filesystem</a>, Up: <a href="Host-Config.html#Host-Config" accesskey="u" rel="up">Host Config</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="Host-Common-1"></a> +<h3 class="section">19.1 Host Common</h3> +<a name="index-host-hooks"></a> +<a name="index-host-functions"></a> + +<p>Some things are just not portable, even between similar operating systems, +and are too difficult for autoconf to detect. They get implemented using +hook functions in the file specified by the <var>host_hook_obj</var> +variable in <samp>config.gcc</samp>. +</p> +<dl> +<dt><a name="index-HOST_005fHOOKS_005fEXTRA_005fSIGNALS"></a>Host Hook: <em>void</em> <strong>HOST_HOOKS_EXTRA_SIGNALS</strong> <em>(void)</em></dt> +<dd><p>This host hook is used to set up handling for extra signals. The most +common thing to do in this hook is to detect stack overflow. +</p></dd></dl> + +<dl> +<dt><a name="index-HOST_005fHOOKS_005fGT_005fPCH_005fGET_005fADDRESS"></a>Host Hook: <em>void *</em> <strong>HOST_HOOKS_GT_PCH_GET_ADDRESS</strong> <em>(size_t <var>size</var>, int <var>fd</var>)</em></dt> +<dd><p>This host hook returns the address of some space that is likely to be +free in some subsequent invocation of the compiler. We intend to load +the PCH data at this address such that the data need not be relocated. +The area should be able to hold <var>size</var> bytes. If the host uses +<code>mmap</code>, <var>fd</var> is an open file descriptor that can be used for +probing. +</p></dd></dl> + +<dl> +<dt><a name="index-HOST_005fHOOKS_005fGT_005fPCH_005fUSE_005fADDRESS"></a>Host Hook: <em>int</em> <strong>HOST_HOOKS_GT_PCH_USE_ADDRESS</strong> <em>(void * <var>address</var>, size_t <var>size</var>, int <var>fd</var>, size_t <var>offset</var>)</em></dt> +<dd><p>This host hook is called when a PCH file is about to be loaded. +We want to load <var>size</var> bytes from <var>fd</var> at <var>offset</var> +into memory at <var>address</var>. The given address will be the result of +a previous invocation of <code>HOST_HOOKS_GT_PCH_GET_ADDRESS</code>. +Return -1 if we couldn’t allocate <var>size</var> bytes at <var>address</var>. +Return 0 if the memory is allocated but the data is not loaded. Return 1 +if the hook has performed everything. +</p> +<p>If the implementation uses reserved address space, free any reserved +space beyond <var>size</var>, regardless of the return value. If no PCH will +be loaded, this hook may be called with <var>size</var> zero, in which case +all reserved address space should be freed. +</p> +<p>Do not try to handle values of <var>address</var> that could not have been +returned by this executable; just return -1. Such values usually +indicate an out-of-date PCH file (built by some other GCC executable), +and such a PCH file won’t work. +</p></dd></dl> + +<dl> +<dt><a name="index-HOST_005fHOOKS_005fGT_005fPCH_005fALLOC_005fGRANULARITY"></a>Host Hook: <em>size_t</em> <strong>HOST_HOOKS_GT_PCH_ALLOC_GRANULARITY</strong> <em>(void);</em></dt> +<dd><p>This host hook returns the alignment required for allocating virtual +memory. Usually this is the same as getpagesize, but on some hosts the +alignment for reserving memory differs from the pagesize for committing +memory. +</p></dd></dl> + +<hr> +<div class="header"> +<p> +Next: <a href="Filesystem.html#Filesystem" accesskey="n" rel="next">Filesystem</a>, Up: <a href="Host-Config.html#Host-Config" accesskey="u" rel="up">Host Config</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> |