6 If you are using a released version of LLVM, see `the download page
7 <http://llvm.org/releases/>`_ to find your documentation.
9 The LLVM compiler infrastructure supports a wide range of projects, from
10 industrial strength compilers to specialized JIT applications to small
13 Similarly, documentation is broken down into several high-level groupings
14 targeted at different audiences:
16 LLVM Design & Overview
17 ======================
19 Several introductory papers and presentations.
27 Defines the LLVM intermediate representation.
29 `Introduction to the LLVM Compiler`__
30 Presentation providing a users introduction to LLVM.
32 .. __: http://llvm.org/pubs/2008-10-04-ACAT-LLVM-Intro.html
35 Book chapter providing a compiler hacker's introduction to LLVM.
37 .. __: http://www.aosabook.org/en/llvm.html
40 `LLVM: A Compilation Framework for Lifelong Program Analysis & Transformation`__
43 .. __: http://llvm.org/pubs/2004-01-30-CGO-LLVM.html
45 `LLVM: An Infrastructure for Multi-Stage Optimization`__
46 More details (quite old now).
48 .. __: http://llvm.org/pubs/2002-12-LattnerMSThesis.html
50 `Publications mentioning LLVM <http://llvm.org/pubs>`_
56 For those new to the LLVM system.
58 NOTE: If you are a user who is only interested in using LLVM-based
59 compilers, you should look into `Clang <http://clang.llvm.org>`_ or
60 `DragonEgg <http://dragonegg.llvm.org>`_ instead. The documentation here is
61 intended for users who have a need to work with the intermediate LLVM
71 HowToCrossCompileBuiltinsOnArm
81 SphinxQuickstartTemplate
89 Frontend/PerformanceTips
90 MCJITDesignAndImplementation
98 Discusses how to get up and running quickly with the LLVM infrastructure.
99 Everything from unpacking and compilation of the distribution to execution
103 An addendum to the main Getting Started guide for those using the `CMake
104 build system <http://www.cmake.org>`_.
106 :doc:`HowToBuildOnARM`
107 Notes on building and testing LLVM/Clang on ARM.
109 :doc:`HowToCrossCompileBuiltinsOnArm`
110 Notes on cross-building and testing the compiler-rt builtins for Arm.
112 :doc:`HowToCrossCompileLLVM`
113 Notes on cross-building and testing LLVM/Clang.
115 :doc:`GettingStartedVS`
116 An addendum to the main Getting Started guide for those using Visual Studio
119 :doc:`tutorial/index`
120 Tutorials about using LLVM. Includes a tutorial about making a custom
123 :doc:`LLVM Command Guide <CommandGuide/index>`
124 A reference manual for the LLVM command line utilities ("man" pages for LLVM
128 A list of optimizations and analyses implemented in LLVM.
131 A list of common questions and problems and their solutions.
133 :doc:`Release notes for the current release <ReleaseNotes>`
134 This describes new features, known bugs, and other limitations.
136 :doc:`HowToSubmitABug`
137 Instructions for properly submitting information about any bugs you run into
140 :doc:`SphinxQuickstartTemplate`
141 A template + tutorial for writing new Sphinx documentation. It is meant
142 to be read in source form.
144 :doc:`LLVM Testing Infrastructure Guide <TestingGuide>`
145 A reference manual for using the LLVM testing infrastructure.
147 `How to build the C, C++, ObjC, and ObjC++ front end`__
148 Instructions for building the clang front-end from source.
150 .. __: http://clang.llvm.org/get_started.html
153 Definition of acronyms, terms and concepts used in LLVM.
155 :doc:`HowToAddABuilder`
156 Instructions for adding new builder to LLVM buildbot master.
159 A reference guide for using LLVM's YAML I/O library.
162 Answers to some very frequent questions about LLVM's most frequently
163 misunderstood instruction.
165 :doc:`Frontend/PerformanceTips`
166 A collection of tips for frontend authors on how to generate IR
167 which LLVM is able to effectively optimize.
170 A reference for using Dockerfiles provided with LLVM.
173 Programming Documentation
174 =========================
176 For developers of applications which use LLVM as a library.
186 HowToSetUpLLVMStyleRTTI
191 ScudoHardenedAllocator
194 :doc:`LLVM Language Reference Manual <LangRef>`
195 Defines the LLVM intermediate representation and the assembly form of the
199 Information about LLVM's concurrency model.
201 :doc:`ProgrammersManual`
202 Introduction to the general layout of the LLVM sourcebase, important classes
203 and APIs, and some tips & tricks.
206 LLVM-specific extensions to tools and formats LLVM seeks compatibility with.
209 Provides information on using the command line parsing library.
211 :doc:`CodingStandards`
212 Details the LLVM coding standards and provides useful information on writing
215 :doc:`HowToSetUpLLVMStyleRTTI`
216 How to make ``isa<>``, ``dyn_cast<>``, etc. available for clients of your
220 Look here to see how to add instructions and intrinsics to LLVM.
222 `Doxygen generated documentation <http://llvm.org/doxygen/>`_
223 (`classes <http://llvm.org/doxygen/inherits.html>`_)
225 `Documentation for Go bindings <http://godoc.org/llvm.org/llvm/bindings/go/llvm>`_
227 `ViewVC Repository Browser <http://llvm.org/viewvc/>`_
230 :doc:`CompilerWriterInfo`
231 A list of helpful links for compiler writers.
234 A library for writing in-process guided fuzzers.
237 Information on writing and using Fuzzers to find bugs in LLVM.
239 :doc:`ScudoHardenedAllocator`
240 A library that implements a security-hardened `malloc()`.
243 A command line option for debugging optimization-induced failures.
245 .. _index-subsystem-docs:
247 Subsystem Documentation
248 =======================
250 For API clients and LLVM developers.
258 BlockFrequencyTerminology
282 CoverageMappingFormat
296 :doc:`WritingAnLLVMPass`
297 Information on how to write LLVM transformations and analyses.
299 :doc:`WritingAnLLVMBackend`
300 Information on how to write LLVM backends for machine targets.
303 The design and implementation of the LLVM code generator. Useful if you are
304 working on retargetting LLVM to a new architecture, designing a new codegen
305 pass, or enhancing existing components.
307 :doc:`Machine IR (MIR) Format Reference Manual <MIRLangRef>`
308 A reference manual for the MIR serialization format, which is used to test
309 LLVM's code generation passes.
311 :doc:`TableGen <TableGen/index>`
312 Describes the TableGen tool, which is used heavily by the LLVM code
316 Information on how to write a new alias analysis implementation or how to
317 use existing analyses.
320 Information about the MemorySSA utility in LLVM, as well as how to use it.
322 :doc:`GarbageCollection`
323 The interfaces source-language compilers should use for compiling GC'd
326 :doc:`Source Level Debugging with LLVM <SourceLevelDebugging>`
327 This document describes the design and philosophy behind the LLVM
328 source-level debugger.
331 This document describes the current status of vectorization in LLVM.
333 :doc:`ExceptionHandling`
334 This document describes the design and implementation of exception handling
338 Automatic bug finder and test-case reducer description and usage
342 This describes the file format and encoding used for LLVM "bc" files.
344 :doc:`System Library <SystemLibrary>`
345 This document describes the LLVM System Library (``lib/System``) and
346 how to keep LLVM source code portable
348 :doc:`LinkTimeOptimization`
349 This document describes the interface between LLVM intermodular optimizer
350 and the linker and its design
353 How to build your programs with link-time optimization on Linux.
355 :doc:`DebuggingJITedCode`
356 How to debug JITed code with GDB.
358 :doc:`MCJITDesignAndImplementation`
359 Describes the inner workings of MCJIT execution engine.
361 :doc:`BranchWeightMetadata`
362 Provides information about Branch Prediction Information.
364 :doc:`BlockFrequencyTerminology`
365 Provides information about terminology used in the ``BlockFrequencyInfo``
368 :doc:`SegmentedStacks`
369 This document describes segmented stacks and how they are used in LLVM.
371 :doc:`MarkedUpDisassembly`
372 This document describes the optional rich disassembly output syntax.
374 :doc:`HowToUseAttributes`
375 Answers some questions about the new Attributes infrastructure.
378 This document describes using the NVPTX backend to compile GPU kernels.
381 This document describes using the AMDGPU backend to compile GPU kernels.
384 LLVM support for mapping instruction addresses to the location of
385 values and allowing code to be patched.
388 LLVM's support for generating NEON instructions on big endian ARM targets is
389 somewhat nonintuitive. This document explains the implementation and rationale.
391 :doc:`CoverageMappingFormat`
392 This describes the format and encoding used for LLVM’s code coverage mapping.
395 This describes a set of experimental extensions for garbage
398 :doc:`MergeFunctions`
399 Describes functions merging optimization.
402 Description of the ``inalloca`` argument attribute.
405 LLVM support for folding control flow into faulting machine instructions.
407 :doc:`CompileCudaWithLLVM`
408 LLVM support for CUDA.
411 LLVM support for coroutines.
414 This describes the prototype instruction selection replacement, GlobalISel.
417 High-level documentation of how to use XRay in LLVM.
420 An example of how to debug an application with XRay.
422 :doc:`The Microsoft PDB File Format <PDB/index>`
423 A detailed description of the Microsoft PDB (Program Database) file format.
426 A description of the verification tool for Control Flow Integrity.
428 Development Process Documentation
429 =================================
431 Information about LLVM's development process.
446 An overview on how to contribute to LLVM.
448 :doc:`DeveloperPolicy`
449 The LLVM project's policy towards developers and their contributions.
452 How-to guide and templates for new projects that *use* the LLVM
453 infrastructure. The templates (directory organization, Makefiles, and test
454 tree) allow the project code to be located outside (or inside) the ``llvm/``
455 tree, while using LLVM header files and libraries.
458 Describes the LLVMBuild organization and files used by LLVM to specify
459 component descriptions.
461 :doc:`HowToReleaseLLVM`
462 This is a guide to preparing LLVM releases. Most developers can ignore it.
464 :doc:`ReleaseProcess`
465 This is a guide to validate a new release, during the release process. Most developers can ignore it.
468 Advice on packaging LLVM into a distribution.
471 Describes how to use the Phabricator code review tool hosted on
472 http://reviews.llvm.org/ and its command line interface, Arcanist.
477 LLVM has a thriving community of friendly and helpful developers.
478 The two primary communication mechanisms in the LLVM community are mailing
484 If you can't find what you need in these docs, try consulting the mailing
487 `Developer's List (llvm-dev)`__
488 This list is for people who want to be included in technical discussions of
489 LLVM. People post to this list when they have questions about writing code
490 for or using the LLVM tools. It is relatively low volume.
492 .. __: http://lists.llvm.org/mailman/listinfo/llvm-dev
494 `Commits Archive (llvm-commits)`__
495 This list contains all commit messages that are made when LLVM developers
496 commit code changes to the repository. It also serves as a forum for
497 patch review (i.e. send patches here). It is useful for those who want to
498 stay on the bleeding edge of LLVM development. This list is very high
501 .. __: http://lists.llvm.org/pipermail/llvm-commits/
503 `Bugs & Patches Archive (llvm-bugs)`__
504 This list gets emailed every time a bug is opened and closed. It is
505 higher volume than the LLVM-dev list.
507 .. __: http://lists.llvm.org/pipermail/llvm-bugs/
509 `Test Results Archive (llvm-testresults)`__
510 A message is automatically sent to this list by every active nightly tester
511 when it completes. As such, this list gets email several times each day,
512 making it a high volume list.
514 .. __: http://lists.llvm.org/pipermail/llvm-testresults/
516 `LLVM Announcements List (llvm-announce)`__
517 This is a low volume list that provides important announcements regarding
518 LLVM. It gets email about once a month.
520 .. __: http://lists.llvm.org/mailman/listinfo/llvm-announce
525 Users and developers of the LLVM project (including subprojects such as Clang)
526 can be found in #llvm on `irc.oftc.net <irc://irc.oftc.net/llvm>`_.
528 This channel has several bots.
532 * llvmbb - Bot for the main LLVM buildbot master.
533 http://lab.llvm.org:8011/console
534 * bb-chapuni - An individually run buildbot master. http://bb.pgr.jp/console
535 * smooshlab - Apple's internal buildbot master.
537 * robot - Bugzilla linker. %bug <number>
539 * clang-bot - A `geordi <http://www.eelis.net/geordi/>`_ instance running
540 near-trunk clang instead of gcc.
542 Community wide proposals
543 ------------------------
545 Proposals for massive changes in how the community behaves and how the work flow
553 Proposals/VectorizationPlan
556 Proposal to adopt a code of conduct on the LLVM social spaces (lists, events,
559 :doc:`Proposals/GitHubMove`
560 Proposal to move from SVN/Git to GitHub.
562 :doc:`Proposals/VectorizationPlan`
563 Proposal to model the process and upgrade the infrastructure of LLVM's Loop Vectorizer.