mirror of
https://github.com/RPCSX/llvm.git
synced 2024-11-29 22:50:47 +00:00
1721784a1b
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15080 91177308-0d34-0410-b5e6-96231b3b80d8
204 lines
7.7 KiB
HTML
204 lines
7.7 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
|
|
"http://www.w3.org/TR/html4/strict.dtd">
|
|
<html>
|
|
<head>
|
|
<title>System Library</title>
|
|
<link rel="stylesheet" href="llvm.css" type="text/css">
|
|
</head>
|
|
<body>
|
|
|
|
<div class="doc_title">System Library</div>
|
|
|
|
<div class="doc_warning">
|
|
<p>Warning: This document is a work in progress.</p>
|
|
</div>
|
|
|
|
<ul>
|
|
<li><a href="#abstract">Abstract</a></li>
|
|
<li><a href="#requirements">System Library Requirements</a>
|
|
<ol>
|
|
<li><a href="#headers">Hide System Header Files</a></li>
|
|
<li><a href="#nofunc">No Exposed Functions</a></li>
|
|
<li><a href="#nodata">No Exposed Data</a></li>
|
|
<li><a href="#xcptns">No Exceptions</a></li>
|
|
<li><a href="#errors">Standard Error Codes</a></li>
|
|
<li><a href="#overhead">Minimize Overhead</a></li>
|
|
</ol></li>
|
|
<li><a href="#design">System Library Design</a>
|
|
<ol>
|
|
<li><a href="#opaque">Use Opaque Classes</a></li>
|
|
<li><a href="#common">Common Implementations</a></li>
|
|
<li><a href="#multi_imps">Multiple Implementations</a></li>
|
|
<li><a href="#lowlevel">Use Low Level Interfaces</a></li>
|
|
<li><a href="#memalloc">No Memory Allocation</a></li>
|
|
<li><a href="#virtuals">No Virtual Methods</a></li>
|
|
</ol></li>
|
|
<li><a href="#detail">System Library Details</a>
|
|
<ol>
|
|
<li><a href="#bug">Tracking Bugzilla Bug: 351</a></li>
|
|
<li><a href="#refimpl">Reference Implementatation</a></li>
|
|
</ol></li>
|
|
</ul>
|
|
|
|
<div class="doc_author">
|
|
<p>Written by <a href="rspencer@x10sys.com">Reid Spencer</a></p>
|
|
</div>
|
|
|
|
|
|
<!-- *********************************************************************** -->
|
|
<div class="doc_section"><a name="abstract">Abstract</a></div>
|
|
<div class="doc_text">
|
|
<p>This document describes the requirements, design, and implementation
|
|
details of LLVM's System Library. The library is composed of the header files
|
|
in <tt>llvm/include/llvm/System</tt> and the source files in
|
|
<tt>llvm/lib/System</tt>. The goal of this library is to completely shield
|
|
LLVM from the variations in operating system interfaces. By centralizing
|
|
LLVM's use of operating system interfaces, we make it possible for the LLVM
|
|
tool chain and runtime libraries to be more easily ported to new platforms.
|
|
The library also unclutters the rest of LLVM from #ifdef use and special
|
|
cases for specific operating systems.</p>
|
|
<p>The System Library was donated to LLVM by Reid Spencer who formulated the
|
|
original design as part of the eXtensible Programming System (XPS) which is
|
|
based, in part, on LLVM.</p>
|
|
</div>
|
|
|
|
<!-- *********************************************************************** -->
|
|
<div class="doc_section">
|
|
<a name="requirements">System Library Requirements</a>
|
|
</div>
|
|
<div class="doc_text">
|
|
<p>The System library's requirements are aimed at shielding LLVM from the
|
|
variations in operating system interfaces. The following sections define the
|
|
requirements needed to fulfill this objective.</p>
|
|
</div>
|
|
|
|
<!-- ======================================================================= -->
|
|
<div class="doc_subsection"><a name="headers">Hide System Header Files</a></div>
|
|
<div class="doc_text">
|
|
<p>To be written.</p>
|
|
</div>
|
|
|
|
<!-- ======================================================================= -->
|
|
<div class="doc_subsection"><a name="nofunc">No Exposed Functions</a></div>
|
|
<div class="doc_text">
|
|
<p>To be written.</p>
|
|
</div>
|
|
|
|
<!-- ======================================================================= -->
|
|
<div class="doc_subsection"><a name="nodata">No Exposed Data</a></div>
|
|
<div class="doc_text">
|
|
<p>To be written.</p>
|
|
</div>
|
|
|
|
<!-- ======================================================================= -->
|
|
<div class="doc_subsection"><a name="xcptns">No Exceptions</a></div>
|
|
<div class="doc_text">
|
|
<p>To be written.</p>
|
|
</div>
|
|
|
|
<!-- ======================================================================= -->
|
|
<div class="doc_subsection"><a name="errors">Standard Error Codes</a></div>
|
|
<div class="doc_text">
|
|
<p>To be written.</p>
|
|
</div>
|
|
|
|
<!-- ======================================================================= -->
|
|
<div class="doc_subsection"><a name="overhead">Minimize Overhead</a></div>
|
|
<div class="doc_text">
|
|
<p>To be written.</p>
|
|
</div>
|
|
|
|
<!-- *********************************************************************** -->
|
|
<div class="doc_section"><a name="design">System Library Design</a></div>
|
|
<div class="doc_text">
|
|
<p>In order to fulfill the requirements of the system library, strict design
|
|
objectives must be maintained in the library as it evolves. The goal here
|
|
is to provide interfaces to operating system concepts (files, memory maps,
|
|
sockets, signals, locking, etc) efficiently and in such a way that the
|
|
remainder of LLVM is completely operating system agnostic.</p>
|
|
</div>
|
|
|
|
<!-- ======================================================================= -->
|
|
<div class="doc_subsection"><a name="opaque">Use Opaque Classes</a></div>
|
|
<div class="doc_text">
|
|
<p>no public data</p>
|
|
<p>onlyprimitive typed private/protected data</p>
|
|
<p>data size is "right" for platform, not max of all platforms</p>
|
|
<p>each class corresponds to O/S concept</p>
|
|
</div>
|
|
|
|
<!-- ======================================================================= -->
|
|
<div class="doc_subsection"><a name="common">Common Implementations</a></div>
|
|
<div class="doc_text">
|
|
<p>To be written.</p>
|
|
</div>
|
|
|
|
<!-- ======================================================================= -->
|
|
<div class="doc_subsection">
|
|
<a name="multi_imps">Multiple Implementations</a>
|
|
</div>
|
|
<div class="doc_text">
|
|
<p>To be written.</p>
|
|
</div>
|
|
|
|
<!-- ======================================================================= -->
|
|
<div class="doc_subsection">
|
|
<a name="low_level">Use Low Level Interfaces</a>
|
|
</div>
|
|
<div class="doc_text">
|
|
<p>To be written.</p>
|
|
</div>
|
|
|
|
<!-- ======================================================================= -->
|
|
<div class="doc_subsection"><a name="memalloc">No Memory Allocation</a></div>
|
|
<div class="doc_text">
|
|
<p>To be written.</p>
|
|
</div>
|
|
|
|
<!-- ======================================================================= -->
|
|
<div class="doc_subsection"><a name="virtuals">No Virtual Methods</a></div>
|
|
<div class="doc_text">
|
|
<p>To be written.</p>
|
|
</div>
|
|
|
|
<!-- *********************************************************************** -->
|
|
<div class="doc_section"><a name="detail">System Library Details</a></div>
|
|
<div class="doc_text">
|
|
<p>To be written.</p>
|
|
</div>
|
|
|
|
<!-- ======================================================================= -->
|
|
<div class="doc_subsection"><a name="bug">Bug 351</a></div>
|
|
<div class="doc_text">
|
|
<p>See <a href="http://llvm.cs.uiuc.edu/PR351">bug 351</a>
|
|
for further details on the progress of this work</p>
|
|
</div>
|
|
|
|
<!-- ======================================================================= -->
|
|
<div class="doc_subsection">
|
|
<a name="refimpl">Reference Implementation</a>
|
|
</div>
|
|
<div class="doc_text">
|
|
<p>The <tt>linux</tt> implementation of the system library will always be the
|
|
reference implementation. This means that (a) the concepts defined by the
|
|
linux must be identically replicated in the other implementations and (b) the
|
|
linux implementation must always be complete (provide implementations for all
|
|
concepts).</p>
|
|
</div>
|
|
|
|
<!-- *********************************************************************** -->
|
|
|
|
<hr>
|
|
<address>
|
|
<a href="http://jigsaw.w3.org/css-validator/check/referer"><img
|
|
src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
|
|
<a href="http://validator.w3.org/check/referer"><img
|
|
src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
|
|
|
|
<a href="mailto:rspencer@x10sys.com">Reid Spencer</a><br>
|
|
<a href="http://llvm.cs.uiuc.edu">LLVM Compiler Infrastructure</a><br>
|
|
Last modified: $Date$
|
|
</address>
|
|
</body>
|
|
</html>
|