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141 lines
6.6 KiB
HTML
141 lines
6.6 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>Host Common (GNU Compiler Collection (GCC) Internals)</title>
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<meta name="description" content="Host Common (GNU Compiler Collection (GCC) Internals)">
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<meta name="keywords" content="Host Common (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="Host-Config.html#Host-Config" rel="up" title="Host Config">
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<link href="Filesystem.html#Filesystem" rel="next" title="Filesystem">
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<link href="Host-Config.html#Host-Config" rel="prev" title="Host Config">
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<style type="text/css">
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<!--
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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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blockquote.smallquotation {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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div.smallexample {margin-left: 3.2em}
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div.smalllisp {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.smallformat {font-family: inherit; 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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span.roman {font-family: initial; font-weight: normal}
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span.sansserif {font-family: sans-serif; font-weight: normal}
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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="Host-Common"></a>
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<div class="header">
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<p>
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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>
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</div>
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<hr>
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<a name="Host-Common-1"></a>
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<h3 class="section">19.1 Host Common</h3>
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<a name="index-host-hooks"></a>
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<a name="index-host-functions"></a>
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<p>Some things are just not portable, even between similar operating systems,
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and are too difficult for autoconf to detect. They get implemented using
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hook functions in the file specified by the <var>host_hook_obj</var>
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variable in <samp>config.gcc</samp>.
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</p>
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<dl>
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<dt><a name="index-HOST_005fHOOKS_005fEXTRA_005fSIGNALS"></a>Host Hook: <em>void</em> <strong>HOST_HOOKS_EXTRA_SIGNALS</strong> <em>(void)</em></dt>
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<dd><p>This host hook is used to set up handling for extra signals. The most
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common thing to do in this hook is to detect stack overflow.
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</p></dd></dl>
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<dl>
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<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>
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<dd><p>This host hook returns the address of some space that is likely to be
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free in some subsequent invocation of the compiler. We intend to load
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the PCH data at this address such that the data need not be relocated.
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The area should be able to hold <var>size</var> bytes. If the host uses
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<code>mmap</code>, <var>fd</var> is an open file descriptor that can be used for
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probing.
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</p></dd></dl>
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<dl>
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<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>
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<dd><p>This host hook is called when a PCH file is about to be loaded.
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We want to load <var>size</var> bytes from <var>fd</var> at <var>offset</var>
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into memory at <var>address</var>. The given address will be the result of
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a previous invocation of <code>HOST_HOOKS_GT_PCH_GET_ADDRESS</code>.
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Return -1 if we couldn’t allocate <var>size</var> bytes at <var>address</var>.
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Return 0 if the memory is allocated but the data is not loaded. Return 1
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if the hook has performed everything.
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</p>
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<p>If the implementation uses reserved address space, free any reserved
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space beyond <var>size</var>, regardless of the return value. If no PCH will
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be loaded, this hook may be called with <var>size</var> zero, in which case
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all reserved address space should be freed.
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</p>
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<p>Do not try to handle values of <var>address</var> that could not have been
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returned by this executable; just return -1. Such values usually
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indicate an out-of-date PCH file (built by some other GCC executable),
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and such a PCH file won’t work.
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</p></dd></dl>
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<dl>
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<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>
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<dd><p>This host hook returns the alignment required for allocating virtual
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memory. Usually this is the same as getpagesize, but on some hosts the
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alignment for reserving memory differs from the pagesize for committing
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memory.
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</p></dd></dl>
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<hr>
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|
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<div class="header">
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<p>
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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>
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</div>
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</body>
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</html>
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