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
82 MarkdownQuickstartTemplate
90 Frontend/PerformanceTips
91 MCJITDesignAndImplementation
99 Discusses how to get up and running quickly with the LLVM infrastructure.
100 Everything from unpacking and compilation of the distribution to execution
104 An addendum to the main Getting Started guide for those using the `CMake
105 build system <http://www.cmake.org>`_.
107 :doc:`HowToBuildOnARM`
108 Notes on building and testing LLVM/Clang on ARM.
110 :doc:`HowToCrossCompileBuiltinsOnArm`
111 Notes on cross-building and testing the compiler-rt builtins for Arm.
113 :doc:`HowToCrossCompileLLVM`
114 Notes on cross-building and testing LLVM/Clang.
116 :doc:`GettingStartedVS`
117 An addendum to the main Getting Started guide for those using Visual Studio
120 :doc:`tutorial/index`
121 Tutorials about using LLVM. Includes a tutorial about making a custom
124 :doc:`LLVM Command Guide <CommandGuide/index>`
125 A reference manual for the LLVM command line utilities ("man" pages for LLVM
129 A list of optimizations and analyses implemented in LLVM.
132 A list of common questions and problems and their solutions.
134 :doc:`Release notes for the current release <ReleaseNotes>`
135 This describes new features, known bugs, and other limitations.
137 :doc:`HowToSubmitABug`
138 Instructions for properly submitting information about any bugs you run into
141 :doc:`SphinxQuickstartTemplate`
142 A template + tutorial for writing new Sphinx documentation. It is meant
143 to be read in source form.
145 :doc:`LLVM Testing Infrastructure Guide <TestingGuide>`
146 A reference manual for using the LLVM testing infrastructure.
148 :doc:`TestSuiteGuide`
149 Describes how to compile and run the test-suite benchmarks.
151 `How to build the C, C++, ObjC, and ObjC++ front end`__
152 Instructions for building the clang front-end from source.
154 .. __: http://clang.llvm.org/get_started.html
157 Definition of acronyms, terms and concepts used in LLVM.
159 :doc:`HowToAddABuilder`
160 Instructions for adding new builder to LLVM buildbot master.
163 A reference guide for using LLVM's YAML I/O library.
166 Answers to some very frequent questions about LLVM's most frequently
167 misunderstood instruction.
169 :doc:`Frontend/PerformanceTips`
170 A collection of tips for frontend authors on how to generate IR
171 which LLVM is able to effectively optimize.
174 A reference for using Dockerfiles provided with LLVM.
177 Programming Documentation
178 =========================
180 For developers of applications which use LLVM as a library.
190 HowToSetUpLLVMStyleRTTI
195 ScudoHardenedAllocator
198 :doc:`LLVM Language Reference Manual <LangRef>`
199 Defines the LLVM intermediate representation and the assembly form of the
203 Information about LLVM's concurrency model.
205 :doc:`ProgrammersManual`
206 Introduction to the general layout of the LLVM sourcebase, important classes
207 and APIs, and some tips & tricks.
210 LLVM-specific extensions to tools and formats LLVM seeks compatibility with.
213 Provides information on using the command line parsing library.
215 :doc:`CodingStandards`
216 Details the LLVM coding standards and provides useful information on writing
219 :doc:`HowToSetUpLLVMStyleRTTI`
220 How to make ``isa<>``, ``dyn_cast<>``, etc. available for clients of your
224 Look here to see how to add instructions and intrinsics to LLVM.
226 `Doxygen generated documentation <http://llvm.org/doxygen/>`_
227 (`classes <http://llvm.org/doxygen/inherits.html>`_)
229 `Documentation for Go bindings <http://godoc.org/llvm.org/llvm/bindings/go/llvm>`_
231 `ViewVC Repository Browser <http://llvm.org/viewvc/>`_
234 :doc:`CompilerWriterInfo`
235 A list of helpful links for compiler writers.
238 A library for writing in-process guided fuzzers.
241 Information on writing and using Fuzzers to find bugs in LLVM.
243 :doc:`ScudoHardenedAllocator`
244 A library that implements a security-hardened `malloc()`.
247 A command line option for debugging optimization-induced failures.
249 .. _index-subsystem-docs:
251 Subsystem Documentation
252 =======================
254 For API clients and LLVM developers.
262 BlockFrequencyTerminology
287 CoverageMappingFormat
300 SpeculativeLoadHardening
302 :doc:`WritingAnLLVMPass`
303 Information on how to write LLVM transformations and analyses.
305 :doc:`WritingAnLLVMBackend`
306 Information on how to write LLVM backends for machine targets.
309 The design and implementation of the LLVM code generator. Useful if you are
310 working on retargetting LLVM to a new architecture, designing a new codegen
311 pass, or enhancing existing components.
313 :doc:`Machine IR (MIR) Format Reference Manual <MIRLangRef>`
314 A reference manual for the MIR serialization format, which is used to test
315 LLVM's code generation passes.
317 :doc:`TableGen <TableGen/index>`
318 Describes the TableGen tool, which is used heavily by the LLVM code
322 Information on how to write a new alias analysis implementation or how to
323 use existing analyses.
326 Information about the MemorySSA utility in LLVM, as well as how to use it.
328 :doc:`GarbageCollection`
329 The interfaces source-language compilers should use for compiling GC'd
332 :doc:`Source Level Debugging with LLVM <SourceLevelDebugging>`
333 This document describes the design and philosophy behind the LLVM
334 source-level debugger.
337 This document describes the current status of vectorization in LLVM.
339 :doc:`ExceptionHandling`
340 This document describes the design and implementation of exception handling
344 Automatic bug finder and test-case reducer description and usage
348 This describes the file format and encoding used for LLVM "bc" files.
350 :doc:`Support Library <SupportLibrary>`
351 This document describes the LLVM Support Library (``lib/Support``) and
352 how to keep LLVM source code portable
354 :doc:`LinkTimeOptimization`
355 This document describes the interface between LLVM intermodular optimizer
356 and the linker and its design
359 How to build your programs with link-time optimization on Linux.
361 :doc:`DebuggingJITedCode`
362 How to debug JITed code with GDB.
364 :doc:`MCJITDesignAndImplementation`
365 Describes the inner workings of MCJIT execution engine.
367 :doc:`BranchWeightMetadata`
368 Provides information about Branch Prediction Information.
370 :doc:`BlockFrequencyTerminology`
371 Provides information about terminology used in the ``BlockFrequencyInfo``
374 :doc:`SegmentedStacks`
375 This document describes segmented stacks and how they are used in LLVM.
377 :doc:`MarkedUpDisassembly`
378 This document describes the optional rich disassembly output syntax.
380 :doc:`HowToUseAttributes`
381 Answers some questions about the new Attributes infrastructure.
384 This document describes using the NVPTX backend to compile GPU kernels.
387 This document describes using the AMDGPU backend to compile GPU kernels.
390 LLVM support for mapping instruction addresses to the location of
391 values and allowing code to be patched.
394 LLVM's support for generating NEON instructions on big endian ARM targets is
395 somewhat nonintuitive. This document explains the implementation and rationale.
397 :doc:`CoverageMappingFormat`
398 This describes the format and encoding used for LLVM’s code coverage mapping.
401 This describes a set of experimental extensions for garbage
404 :doc:`MergeFunctions`
405 Describes functions merging optimization.
408 Description of the ``inalloca`` argument attribute.
411 LLVM support for folding control flow into faulting machine instructions.
413 :doc:`CompileCudaWithLLVM`
414 LLVM support for CUDA.
417 LLVM support for coroutines.
420 This describes the prototype instruction selection replacement, GlobalISel.
423 High-level documentation of how to use XRay in LLVM.
426 An example of how to debug an application with XRay.
428 :doc:`The Microsoft PDB File Format <PDB/index>`
429 A detailed description of the Microsoft PDB (Program Database) file format.
432 A description of the verification tool for Control Flow Integrity.
434 :doc:`SpeculativeLoadHardening`
435 A description of the Speculative Load Hardening mitigation for Spectre v1.
437 Development Process Documentation
438 =================================
440 Information about LLVM's development process.
455 An overview on how to contribute to LLVM.
457 :doc:`DeveloperPolicy`
458 The LLVM project's policy towards developers and their contributions.
461 How-to guide and templates for new projects that *use* the LLVM
462 infrastructure. The templates (directory organization, Makefiles, and test
463 tree) allow the project code to be located outside (or inside) the ``llvm/``
464 tree, while using LLVM header files and libraries.
467 Describes the LLVMBuild organization and files used by LLVM to specify
468 component descriptions.
470 :doc:`HowToReleaseLLVM`
471 This is a guide to preparing LLVM releases. Most developers can ignore it.
473 :doc:`ReleaseProcess`
474 This is a guide to validate a new release, during the release process. Most developers can ignore it.
477 Advice on packaging LLVM into a distribution.
480 Describes how to use the Phabricator code review tool hosted on
481 http://reviews.llvm.org/ and its command line interface, Arcanist.
486 LLVM has a thriving community of friendly and helpful developers.
487 The two primary communication mechanisms in the LLVM community are mailing
493 If you can't find what you need in these docs, try consulting the mailing
496 `Developer's List (llvm-dev)`__
497 This list is for people who want to be included in technical discussions of
498 LLVM. People post to this list when they have questions about writing code
499 for or using the LLVM tools. It is relatively low volume.
501 .. __: http://lists.llvm.org/mailman/listinfo/llvm-dev
503 `Commits Archive (llvm-commits)`__
504 This list contains all commit messages that are made when LLVM developers
505 commit code changes to the repository. It also serves as a forum for
506 patch review (i.e. send patches here). It is useful for those who want to
507 stay on the bleeding edge of LLVM development. This list is very high
510 .. __: http://lists.llvm.org/pipermail/llvm-commits/
512 `Bugs & Patches Archive (llvm-bugs)`__
513 This list gets emailed every time a bug is opened and closed. It is
514 higher volume than the LLVM-dev list.
516 .. __: http://lists.llvm.org/pipermail/llvm-bugs/
518 `Test Results Archive (llvm-testresults)`__
519 A message is automatically sent to this list by every active nightly tester
520 when it completes. As such, this list gets email several times each day,
521 making it a high volume list.
523 .. __: http://lists.llvm.org/pipermail/llvm-testresults/
525 `LLVM Announcements List (llvm-announce)`__
526 This is a low volume list that provides important announcements regarding
527 LLVM. It gets email about once a month.
529 .. __: http://lists.llvm.org/mailman/listinfo/llvm-announce
534 Users and developers of the LLVM project (including subprojects such as Clang)
535 can be found in #llvm on `irc.oftc.net <irc://irc.oftc.net/llvm>`_.
537 This channel has several bots.
541 * llvmbb - Bot for the main LLVM buildbot master.
542 http://lab.llvm.org:8011/console
543 * bb-chapuni - An individually run buildbot master. http://bb.pgr.jp/console
544 * smooshlab - Apple's internal buildbot master.
546 * robot - Bugzilla linker. %bug <number>
548 * clang-bot - A `geordi <http://www.eelis.net/geordi/>`_ instance running
549 near-trunk clang instead of gcc.
551 Community wide proposals
552 ------------------------
554 Proposals for massive changes in how the community behaves and how the work flow
562 Proposals/VectorizationPlan
565 Proposal to adopt a code of conduct on the LLVM social spaces (lists, events,
568 :doc:`Proposals/GitHubMove`
569 Proposal to move from SVN/Git to GitHub.
571 :doc:`Proposals/VectorizationPlan`
572 Proposal to model the process and upgrade the infrastructure of LLVM's Loop Vectorizer.