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|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<link rel="stylesheet" href="llvm.css" type="text/css">
<title>LLVM 2.4 Release Notes</title>
</head>
<body>
<div class="doc_title">LLVM 2.4 Release Notes</div>
<ol>
<li><a href="#intro">Introduction</a></li>
<li><a href="#subproj">Sub-project Status Update</a></li>
<li><a href="#whatsnew">What's New in LLVM?</a></li>
<li><a href="GettingStarted.html">Installation Instructions</a></li>
<li><a href="#portability">Portability and Supported Platforms</a></li>
<li><a href="#knownproblems">Known Problems</a></li>
<li><a href="#additionalinfo">Additional Information</a></li>
</ol>
<div class="doc_author">
<p>Written by the <a href="http://llvm.org">LLVM Team</a></p>
</div>
<!-- *********************************************************************** -->
<div class="doc_section">
<a name="intro">Introduction</a>
</div>
<!-- *********************************************************************** -->
<div class="doc_text">
<p>This document contains the release notes for the LLVM Compiler
Infrastructure, release 2.4. Here we describe the status of LLVM, including
major improvements from the previous release and significant known problems.
All LLVM releases may be downloaded from the <a
href="http://llvm.org/releases/">LLVM releases web site</a>.</p>
<p>For more information about LLVM, including information about the latest
release, please check out the <a href="http://llvm.org/">main LLVM
web site</a>. If you have questions or comments, the <a
href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM Developer's Mailing
List</a> is a good place to send them.</p>
<p>Note that if you are reading this file from a Subversion checkout or the
main LLVM web page, this document applies to the <i>next</i> release, not the
current one. To see the release notes for a specific release, please see the
<a href="http://llvm.org/releases/">releases page</a>.</p>
</div>
<!-- Unfinished features in 2.4:
Machine LICM
Machine Sinking
LegalizeDAGTypes
llc -enable-value-prop, propagation of value info (sign/zero ext info) from
one MBB to another
-->
<!-- for announcement email:
mention dev mtg
Xcode 3.1 and 3.1.1.
-->
<!-- *********************************************************************** -->
<div class="doc_section">
<a name="subproj">Sub-project Status Update</a>
</div>
<!-- *********************************************************************** -->
<div class="doc_text">
<p>
The LLVM 2.4 distribution currently consists of code from the core LLVM
repository (which roughly includes the LLVM optimizers, code generators and
supporting tools) and the llvm-gcc repository. In addition to this code, the
LLVM Project includes other sub-projects that are in development. The two which
are the most actively developed are the <a href="#clang">Clang Project</a> and
the <a href="#vmkit">VMKit Project</a>.
</p>
</div>
<!--=========================================================================-->
<div class="doc_subsection">
<a name="clang">Clang: C/C++/Objective-C Frontend Toolkit</a>
</div>
<div class="doc_text">
<p>The <a href="http://clang.llvm.org/">Clang project</a> is an effort to build
a set of new 'LLVM native' front-end technologies for the LLVM optimizer
and code generator. Clang is continuing to make major strides forward in all
areas. Its C and Objective-C parsing support is very solid, and the code
generation support is far enough along to build many C applications. While not
yet production quality, it is progressing very nicely. In addition, C++
front-end work has started to make significant progress.</p>
<p>Clang, in conjunction with the <tt>ccc</tt> driver, is now usable as a
replacement for gcc for building some small- to medium-sized C applications.
Additionally, Clang now has code generation support for Objective-C on Mac OS X
platform. Major highlights include:</p>
<ul>
<li> Clang/ccc pass almost all of the LLVM test suite on Mac OS X and Linux
on the 32-bit x86 architecture. This includes significant C
applications such as <a href="http://www.sqlite.org">sqlite3</a>,
<a href="http://www.lua.org">lua</a>, and
<a href="http://www.clamav.net">Clam AntiVirus</a>. </li>
<li> Clang can build the majority of Objective-C examples shipped with the
Mac OS X Developer Tools. </li>
</ul>
<p>Clang code generation still needs considerable testing and development,
however. Some areas under active development include:</p>
<ul>
<li> Improved support for C and Objective-C features, for example
variable-length arrays, va_arg, exception handling (Obj-C), and garbage
collection (Obj-C). </li>
<li> ABI compatibility, especially for platforms other than 32-bit
x86. </li>
</ul>
</div>
<!--=========================================================================-->
<div class="doc_subsection">
<a name="clangsa">Clang Static Analyzer</a>
</div>
<div class="doc_text">
<p>The Clang project also includes an early stage static source code analysis
tool for <a href="http://clang.llvm.org/StaticAnalysis.html">automatically
finding bugs</a> in C and Objective-C programs. The tool performs a growing set
of checks to find bugs that occur on a specific path within a program. Examples
of bugs the tool finds include logic errors such as null dereferences,
violations of various API rules, dead code, and potential memory leaks in
Objective-C programs. Since its inception, public feedback on the tool has been
extremely positive, and conservative estimates put the number of real bugs it
has found in industrial-quality software on the order of thousands.</p>
<p>The tool also provides a simple web GUI to inspect potential bugs found by
the tool. While still early in development, the GUI illustrates some of the key
features of Clang: accurate source location information, which is used by the
GUI to highlight specific code expressions that relate to a bug (including those
that span multiple lines); and built-in knowledge of macros, which is used to
perform inline expansion of macros within the GUI itself.</p>
<p>The set of checks performed by the static analyzer is gradually expanding,
and future plans for the tool include full source-level inter-procedural
analysis and deeper checks such as buffer overrun detection. There are many
opportunities to extend and enhance the static analyzer, and anyone interested
in working on this project is encouraged to get involved!</p>
</div>
<!--=========================================================================-->
<div class="doc_subsection">
<a name="vmkit">VMKit: JVM/CLI Virtual Machine Implementation</a>
</div>
<div class="doc_text">
<p>
The <a href="http://vmkit.llvm.org/">VMKit project</a> is an implementation of
a JVM and a CLI Virtual Machines (Microsoft .NET is an
implementation of the CLI) using the Just-In-Time compiler of LLVM.</p>
<p>Following LLVM 2.4, VMKit has its first release 0.24 that you can find on its
<a href="http://vmkit.llvm.org/releases/">webpage</a>. The release includes
bug fixes, cleanup and new features. The major changes are:</p>
<ul>
<li> Support for generics in the .Net virtual machine.</li>
<li> Initial support for the Mono class libraries. </li>
<li> Support for MacOSX/x86, following LLVM's support for exceptions in
JIT on MacOSX/x86. </li>
<li> A new vmkit driver: a program to run java or .net applications. The driver
supports llvm command line arguments including the new "-fast" option. </li>
<li> A new memory allocation scheme in the JVM that makes unloading a
class loader very fast. </li>
<li> VMKit now follows the LLVM Makefile machinery. </li>
</ul>
</div>
<!-- *********************************************************************** -->
<div class="doc_section">
<a name="whatsnew">What's New in LLVM?</a>
</div>
<!-- *********************************************************************** -->
<div class="doc_text">
<p>This release includes a huge number of bug fixes, performance tweaks, and
minor improvements. Some of the major improvements and new features are listed
in this section.
</p>
</div>
<!--=========================================================================-->
<div class="doc_subsection"
|
