1 .. title:: LLDB Homepage
6 Welcome to the LLDB documentation!
8 LLDB is a next generation, high-performance debugger. It is built as a set of
9 reusable components which highly leverage existing libraries in the larger LLVM
10 Project, such as the Clang expression parser and LLVM disassembler.
12 LLDB is the default debugger in Xcode on macOS and supports debugging C,
13 Objective-C and C++ on the desktop and iOS devices and simulator.
15 All of the code in the LLDB project is available under the
16 `"Apache 2.0 License with LLVM exceptions"`_.
18 .. _"Apache 2.0 License with LLVM exceptions": https://llvm.org/docs/DeveloperPolicy.html#new-llvm-project-license-framework
23 For an introduction into the LLDB command language, head over to the `LLDB
24 Tutorial <https://lldb.llvm.org/use/tutorial.html>`_. For users already familiar
25 with GDB there is a cheat sheet listing common tasks and their LLDB equivalent
26 in the `GDB to LLDB command map <https://lldb.llvm.org/use/map.html>`_.
28 There are also multiple resources on how to script LLDB using Python `Python
29 Reference <https://lldb.llvm.org/use/python-reference.html>`_ is a great
30 starting point for that.
32 Compiler Integration Benefits
33 -----------------------------
35 LLDB converts debug information into Clang types so that it can
36 leverage the Clang compiler infrastructure. This allows LLDB to support the
37 latest C, C++, Objective-C and Objective-C++ language features and runtimes in
38 expressions without having to reimplement any of this functionality. It also
39 leverages the compiler to take care of all ABI details when making functions
40 calls for expressions, when disassembling instructions and extracting
41 instruction details, and much more.
43 The major benefits include:
45 - Up to date language support for C, C++, Objective-C
46 - Multi-line expressions that can declare local variables and types
47 - Utilize the JIT for expressions when supported
48 - Evaluate expression Intermediate Representation (IR) when JIT can't be used
53 The LLDB debugger APIs are exposed as a C++ object oriented interface in a
54 shared library. The lldb command line tool links to, and uses this public API.
55 On macOS the shared library is exposed as a framework named LLDB.framework,
56 and Unix systems expose it as lldb.so. The entire API is also then exposed
57 through Python script bindings which allow the API to be used within the LLDB
58 embedded script interpreter, and also in any python script that loads the
59 lldb.py module in standard python script files. See the Python Reference page
60 for more details on how and where Python can be used with the LLDB API.
62 Sharing the LLDB API allows LLDB to not only be used for debugging, but also
63 for symbolication, disassembly, object and symbol file introspection, and much
69 LLDB is known to work on the following platforms, but ports to new platforms
72 * macOS debugging for i386, x86_64 and AArch64
73 * iOS, tvOS, and watchOS simulator debugging on i386, x86_64 and AArch64
74 * iOS, tvOS, and watchOS device debugging on ARM and AArch64
75 * Linux user-space debugging for i386, x86_64, ARM, AArch64, PPC64le, s390x
76 * FreeBSD user-space debugging for i386, x86_64, ARM, AArch64, MIPS64, PPC
77 * NetBSD user-space debugging for i386 and x86_64
78 * Windows user-space debugging for i386, x86_64, ARM and AArch64 (*)
80 (*) Support for Windows is under active development. Basic functionality is
81 expected to work, with functionality improving rapidly. ARM and AArch64 support
82 is more experimental, with more known issues than the others.
87 Check out the LLVM source-tree with git and find the sources in the `lldb`
92 $ git clone https://github.com/llvm/llvm-project.git
94 Note that LLDB generally builds from top-of-trunk using CMake and Ninja.
95 Additionally it builds:
97 * on macOS with a :ref:`generated Xcode project <CMakeGeneratedXcodeProject>`
98 * on Linux and FreeBSD with Clang and libstdc++/libc++
99 * on NetBSD with GCC/Clang and libstdc++/libc++
100 * on Windows with a generated project for VS 2017 or higher
102 See the :doc:`LLDB Build Page <resources/build>` for build instructions.
104 Discussions about LLDB should go to the `LLDB forum
105 <https://discourse.llvm.org/c/subprojects/lldb>`__. Commit
106 messages are automatically sent to the `lldb-commits
107 <http://lists.llvm.org/mailman/listinfo/lldb-commits>`__ mailing list, and
108 this is also the preferred mailing list for patch submissions.
110 See the :doc:`Projects page <status/projects>` if you are looking for some
111 interesting areas to contribute to lldb.
127 :caption: Use & Extension
148 :caption: Development
150 resources/contributing
171 Public Python API <python_api>
172 Public C++ API <https://lldb.llvm.org/cpp_reference/namespacelldb.html>
173 Private C++ API <https://lldb.llvm.org/cpp_reference/index.html>
179 :caption: External Links
181 Source Code <https://github.com/llvm/llvm-project>
182 Code Reviews <https://reviews.llvm.org>
183 Bug Reports <https://github.com/llvm/llvm-project/issues/labels/lldb/>