mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-05-24 02:38:42 +00:00
first step
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37001 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
parent
be1b1b1a74
commit
e9ef4573e2
@ -4,56 +4,126 @@
|
|||||||
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
||||||
<title>LLVM Bitcode File Format</title>
|
<title>LLVM Bitcode File Format</title>
|
||||||
<link rel="stylesheet" href="llvm.css" type="text/css">
|
<link rel="stylesheet" href="llvm.css" type="text/css">
|
||||||
<style type="text/css">
|
|
||||||
TR, TD { border: 2px solid gray; padding-left: 4pt; padding-right: 4pt;
|
|
||||||
padding-top: 2pt; padding-bottom: 2pt; }
|
|
||||||
TH { border: 2px solid gray; font-weight: bold; font-size: 105%; }
|
|
||||||
TABLE { text-align: center; border: 2px solid black;
|
|
||||||
border-collapse: collapse; margin-top: 1em; margin-left: 1em;
|
|
||||||
margin-right: 1em; margin-bottom: 1em; }
|
|
||||||
.td_left { border: 2px solid gray; text-align: left; }
|
|
||||||
</style>
|
|
||||||
</head>
|
</head>
|
||||||
<body>
|
<body>
|
||||||
<div class="doc_title"> LLVM Bitcode File Format </div>
|
<div class="doc_title"> LLVM Bitcode File Format </div>
|
||||||
<ol>
|
<ol>
|
||||||
<li><a href="#abstract">Abstract</a></li>
|
<li><a href="#abstract">Abstract</a></li>
|
||||||
<li><a href="#concepts">Concepts</a></li>
|
<li><a href="#overview">Overview</a></li>
|
||||||
|
<li><a href="#bitstream">Bitstream Format</a>
|
||||||
|
<ol>
|
||||||
|
<li><a href="#magic">Magic Numbers</a></li>
|
||||||
|
</ol>
|
||||||
|
</li>
|
||||||
|
<li><a href="#llvmir">LLVM IR Encoding</a></li>
|
||||||
</ol>
|
</ol>
|
||||||
<div class="doc_author">
|
<div class="doc_author">
|
||||||
<p>Written by <a href="mailto:rspencer@x10sys.com">Reid Spencer</a> and
|
<p>Written by <a href="mailto:sabre@nondot.org">Chris Lattner</a>.
|
||||||
<a href="mailto:sabre@nondot.org">Chris Lattner</a>.
|
|
||||||
</p>
|
</p>
|
||||||
</div>
|
</div>
|
||||||
|
|
||||||
<!-- *********************************************************************** -->
|
<!-- *********************************************************************** -->
|
||||||
<div class="doc_section"> <a name="abstract">Abstract </a></div>
|
<div class="doc_section"> <a name="abstract">Abstract</a></div>
|
||||||
<!-- *********************************************************************** -->
|
<!-- *********************************************************************** -->
|
||||||
|
|
||||||
<div class="doc_text">
|
<div class="doc_text">
|
||||||
<p>This document describes the LLVM bitcode file format. It specifies
|
|
||||||
the binary encoding rules of the bitcode file format so that
|
<p>This document describes the LLVM bitstream file format and the encoding of
|
||||||
equivalent systems can encode bitcode files correctly. The LLVM
|
the LLVM IR into it.</p>
|
||||||
bitcode representation is used to store the intermediate
|
|
||||||
representation on disk in a compacted form.</p>
|
|
||||||
<p>This document supercedes the LLVM bytecode file format for the 2.0
|
|
||||||
release.</p>
|
|
||||||
</div>
|
</div>
|
||||||
|
|
||||||
<!-- *********************************************************************** -->
|
<!-- *********************************************************************** -->
|
||||||
<div class="doc_section"> <a name="concepts">Concepts</a> </div>
|
<div class="doc_section"> <a name="overview">Overview</a></div>
|
||||||
<!-- *********************************************************************** -->
|
<!-- *********************************************************************** -->
|
||||||
|
|
||||||
<div class="doc_text">
|
<div class="doc_text">
|
||||||
<p>This section describes the general concepts of the bitcode file
|
|
||||||
format without getting into specific layout details. It is recommended
|
<p>
|
||||||
that you read this section thoroughly before interpreting the detailed
|
What is commonly known as the LLVM bitcode file format (also, sometimes
|
||||||
descriptions.</p>
|
anachronistically known as bytecode) is actually two things: a <a
|
||||||
|
href="#bitstream">bitstream container format</a>
|
||||||
|
and an <a href="#llvmir">encoding of LLVM IR</a> into the container format.</p>
|
||||||
|
|
||||||
|
<p>
|
||||||
|
The bitstream format is an abstract encoding of structured data, like very
|
||||||
|
similar to XML in some ways. Like XML, bitstream files contain tags, and nested
|
||||||
|
structures, and you can parse the file without having to understand the tags.
|
||||||
|
Unlike XML, the bitstream format is a binary encoding, and unlike XML it
|
||||||
|
provides a mechanism for the file to self-describe "abbreviations", which are
|
||||||
|
effectively size optimizations for the content.</p>
|
||||||
|
|
||||||
|
<p>This document first describes the LLVM bitstream format, then describes the
|
||||||
|
record structure used by LLVM IR files.
|
||||||
|
</p>
|
||||||
|
|
||||||
</div>
|
</div>
|
||||||
|
|
||||||
|
<!-- *********************************************************************** -->
|
||||||
|
<div class="doc_section"> <a name="bitstream">Bitstream Format</a></div>
|
||||||
|
<!-- *********************************************************************** -->
|
||||||
|
|
||||||
|
<div class="doc_text">
|
||||||
|
|
||||||
|
<p>
|
||||||
|
The bitstream format is literally a stream of bits, with a very simple
|
||||||
|
structure. This structure consists of the following concepts:
|
||||||
|
</p>
|
||||||
|
|
||||||
|
<ul>
|
||||||
|
<li>A magic number that identifies the stream.</li>
|
||||||
|
<li>Encoding primitives like variable bit-rate integers.</li>
|
||||||
|
<li>Blocks, which define nested content.</li>
|
||||||
|
<li>Data Records, which describe entities within the file.</li>
|
||||||
|
<li>Abbreviations, which specify compression optimizations for the file.</li>
|
||||||
|
</ul>
|
||||||
|
|
||||||
|
<p>Note that the <a
|
||||||
|
href="CommandGuide/html/llvm-bcanalyzer.html">llvm-bcanalyzer</a> tool can be
|
||||||
|
used to dump and inspect arbitrary bitstreams, which is very useful for
|
||||||
|
understanding the encoding.</p>
|
||||||
|
|
||||||
|
</div>
|
||||||
|
|
||||||
|
<!-- ======================================================================= -->
|
||||||
|
<div class="doc_subsection"><a name="magic">Magic Numbers</a>
|
||||||
|
</div>
|
||||||
|
|
||||||
|
<div class="doc_text">
|
||||||
|
|
||||||
|
<p>LLVM </p>
|
||||||
|
|
||||||
|
</div>
|
||||||
|
|
||||||
|
|
||||||
|
<!-- _______________________________________________________________________ -->
|
||||||
|
<div class="doc_subsubsection"> <a name="wellformed">Well-Formedness</a> </div>
|
||||||
|
|
||||||
|
<div class="doc_text">
|
||||||
|
|
||||||
|
<p>blah
|
||||||
|
</p>
|
||||||
|
|
||||||
|
</div>
|
||||||
|
|
||||||
|
<!-- *********************************************************************** -->
|
||||||
|
<div class="doc_section"> <a name="llvmir">LLVM IR Encoding</a></div>
|
||||||
|
<!-- *********************************************************************** -->
|
||||||
|
|
||||||
|
<div class="doc_text">
|
||||||
|
|
||||||
|
<p></p>
|
||||||
|
|
||||||
|
</div>
|
||||||
|
|
||||||
|
|
||||||
<!-- *********************************************************************** -->
|
<!-- *********************************************************************** -->
|
||||||
<hr>
|
<hr>
|
||||||
<address> <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
|
<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>
|
src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
|
||||||
<a href="http://validator.w3.org/check/referer"><img
|
<a href="http://validator.w3.org/check/referer"><img
|
||||||
src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
|
src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
|
||||||
<a href="mailto:rspencer@x10sys.com">Reid Spencer</a> and <a
|
<a href="mailto:sabre@nondot.org">Chris Lattner</a><br>
|
||||||
href="mailto:sabre@nondot.org">Chris Lattner</a><br>
|
|
||||||
<a href="http://llvm.org">The LLVM Compiler Infrastructure</a><br>
|
<a href="http://llvm.org">The LLVM Compiler Infrastructure</a><br>
|
||||||
Last modified: $Date$
|
Last modified: $Date$
|
||||||
</address>
|
</address>
|
||||||
|
|||||||
Loading…
x
Reference in New Issue
Block a user