2010-06-10 10:48:57 +08:00
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
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<link href="style.css" rel="stylesheet" type="text/css" />
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<title>LLDB Homepage</title>
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</head>
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<body>
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<div class="www_title">
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The <strong>LLDB</strong> Debugger
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</div>
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<div id="container">
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<div id="content">
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2010-06-12 07:04:20 +08:00
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<!--#include virtual="sidebar.incl"-->
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2010-06-10 10:48:57 +08:00
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<div id="middle">
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<div class="post">
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<h1 class ="postheader">What is LLDB?</h1>
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<div class="postcontent">
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<p>LLDB is a next generation, high-performance debugger. It is built as a set
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of reusable components which highly leverage existing libraries in the
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larger LLVM Project, such as the Clang expression parser and LLVM
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disassembler.</p>
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2012-02-23 02:01:09 +08:00
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<p>LLDB is the default debugger in Xcode on Mac OS X and supports
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debugging C, Objective-C and C++ on the desktop and iOS devices and simulator.</p>
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2010-06-10 10:48:57 +08:00
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<p>All of the code in the LLDB project is available under the standard
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<a href="http://llvm.org/docs/DeveloperPolicy.html#license">LLVM
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License</a>, an open source "BSD-style" license.</p>
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</div>
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<div class="postfooter"></div>
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</div>
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<div class="post">
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<h1 class ="postheader">Why a new debugger?</h1>
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<div class="postcontent">
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<p>In order to achieve our goals we decided to start with a fresh architecture
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that would support modern multi-threaded programs, handle debugging symbols
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in an efficient manner, use compiler based code knowledge and have plug-in
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support for functionality and extensions. Additionally we want the debugger
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capabilities to be available to other analysis tools, be they scripts or
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compiled programs, without requiring them to be GPL.</p>
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</div>
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<div class="postfooter"></div>
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</div>
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2012-02-23 02:01:09 +08:00
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<div class="post">
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<h1 class ="postheader">Compiler Integration Benefits</h1>
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<div class="postcontent">
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<p>LLDB currently converts debug information into clang types so that
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it can leverage the clang compiler infrastructure.
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This allows LLDB to support the latest C, C++, Objective C and Objective C++
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language features and runtimes in expressions without having to reimplement <b>any</b>
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of this functionality. It also leverages the compiler to take care of all ABI
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details when making functions calls for expressions, when disassembling
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instructions and extracting instruciton details, and much more.
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<p>The major benefits include:</p>
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<ul>
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<li>Up to date language support for C, C++, Objective C</li>
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<li>Multi-line expressions that can declare local variables and types</li>
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<li>Utilitize the JIT for expressions when supported</li>
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<li>Evaluate expression Intermediate Representation (IR) when JIT can't be used</li>
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</ul>
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</div>
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</div>
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<div class="post">
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<h1 class ="postheader">Reusability</h1>
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<div class="postcontent">
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<p>The LLDB debugger APIs are exposed as a C++ object oriented interface in a shared library.
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The <b>lldb</b> command line tool links to, and uses this public API. On Mac OS X the shared library
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2012-02-23 03:02:32 +08:00
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is exposed as a framework named <b>LLDB.framework</b>, and unix systems expose it as <b>lldb.so</b>.
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2012-02-23 02:01:09 +08:00
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The entire API is also then exposed through Python script bindings which allow the API to be used
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within the LLDB embedded script interpreter, and also in any python script that loads the <b>lldb.py</b>
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module in standard python script files. See the <a href="python-reference.html">Python Reference</a> page for more details on how
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and where Python can be used with the LLDB API.</p>
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<p>Sharing the LLDB API allows LLDB to not only be used for debugging, but also for symbolication,
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disassembly, object and symbol file introspection, and much more.
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</div>
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</div>
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2010-06-10 10:48:57 +08:00
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<div class="post">
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<h1 class ="postheader">Platform Support</h1>
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<div class="postcontent">
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<p>LLDB is known to work on the following platforms, but ports to new
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platforms are welcome:</p>
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<ul>
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2012-02-23 02:01:09 +08:00
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<li>Mac OS X desktop user space debugging for i386 and x86-64</li>
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<li>iOS simulator debugging on i386</li>
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<li>iOS device debugging on ARM</li>
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2010-06-10 10:48:57 +08:00
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</ul>
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</div>
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<div class="postfooter"></div>
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</div>
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<div class="post">
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<h1 class ="postheader">Get it and get involved!</h1>
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<div class="postcontent">
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<p>To check out the code, use:</p>
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<ul>
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<li>svn co http://llvm.org/svn/llvm-project/lldb/trunk lldb</li>
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</ul>
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<p>Note that LLDB currently only builds out of the box on Mac OS X with
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Xcode, but patches to improve portability are definitely welcome.</p>
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<p>Discussions about LLDB should go to the <a href="http://lists.cs.uiuc.edu/mailman/listinfo/lldb-dev">lldb-dev</a> mailing
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list. Commit messages for the lldb SVN module are automatically sent to the
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<a href="http://lists.cs.uiuc.edu/mailman/listinfo/lldb-commits">lldb-commits</a>
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mailing list, and this is also the preferred mailing list for patch
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submissions.</p>
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</div>
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<div class="postfooter"></div>
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</div>
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</div>
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</div>
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</div>
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</body>
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</html>
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