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 an LLVM-based compiler,
59 you should look into `Clang <http://clang.llvm.org>`_ instead. The
60 documentation here is intended for users who have a need to work with the
61 intermediate LLVM representation.
71 HowToCrossCompileBuiltinsOnArm
81 SphinxQuickstartTemplate
82 MarkdownQuickstartTemplate
90 Frontend/PerformanceTips
91 MCJITDesignAndImplementation
101 :doc:`GettingStarted`
102 Discusses how to get up and running quickly with the LLVM infrastructure.
103 Everything from unpacking and compilation of the distribution to execution
107 An addendum to the main Getting Started guide for those using the `CMake
108 build system <http://www.cmake.org>`_.
110 :doc:`HowToBuildOnARM`
111 Notes on building and testing LLVM/Clang on ARM.
113 :doc:`HowToBuildWithPGO`
114 Notes on building LLVM/Clang with PGO.
116 :doc:`HowToCrossCompileBuiltinsOnArm`
117 Notes on cross-building and testing the compiler-rt builtins for Arm.
119 :doc:`HowToCrossCompileLLVM`
120 Notes on cross-building and testing LLVM/Clang.
122 :doc:`GettingStartedVS`
123 An addendum to the main Getting Started guide for those using Visual Studio
126 :doc:`tutorial/index`
127 Tutorials about using LLVM. Includes a tutorial about making a custom
130 :doc:`LLVM Command Guide <CommandGuide/index>`
131 A reference manual for the LLVM command line utilities ("man" pages for LLVM
135 A list of optimizations and analyses implemented in LLVM.
138 A list of common questions and problems and their solutions.
140 :doc:`Release notes for the current release <ReleaseNotes>`
141 This describes new features, known bugs, and other limitations.
143 :doc:`HowToSubmitABug`
144 Instructions for properly submitting information about any bugs you run into
147 :doc:`SphinxQuickstartTemplate`
148 A template + tutorial for writing new Sphinx documentation. It is meant
149 to be read in source form.
151 :doc:`LLVM Testing Infrastructure Guide <TestingGuide>`
152 A reference manual for using the LLVM testing infrastructure.
154 :doc:`TestSuiteGuide`
155 Describes how to compile and run the test-suite benchmarks.
157 `How to build the C, C++, ObjC, and ObjC++ front end`__
158 Instructions for building the clang front-end from source.
160 .. __: http://clang.llvm.org/get_started.html
163 Definition of acronyms, terms and concepts used in LLVM.
165 :doc:`HowToAddABuilder`
166 Instructions for adding new builder to LLVM buildbot master.
169 A reference guide for using LLVM's YAML I/O library.
172 Answers to some very frequent questions about LLVM's most frequently
173 misunderstood instruction.
175 :doc:`Frontend/PerformanceTips`
176 A collection of tips for frontend authors on how to generate IR
177 which LLVM is able to effectively optimize.
180 A reference for using Dockerfiles provided with LLVM.
182 :doc:`BuildingADistribution`
183 A best-practices guide for using LLVM's CMake build system to package and
184 distribute LLVM-based tools.
187 A reference on the implementation of remarks in LLVM.
189 Programming Documentation
190 =========================
192 For developers of applications which use LLVM as a library.
202 HowToSetUpLLVMStyleRTTI
207 ScudoHardenedAllocator
210 :doc:`LLVM Language Reference Manual <LangRef>`
211 Defines the LLVM intermediate representation and the assembly form of the
215 Information about LLVM's concurrency model.
217 :doc:`ProgrammersManual`
218 Introduction to the general layout of the LLVM sourcebase, important classes
219 and APIs, and some tips & tricks.
222 LLVM-specific extensions to tools and formats LLVM seeks compatibility with.
225 Provides information on using the command line parsing library.
227 :doc:`CodingStandards`
228 Details the LLVM coding standards and provides useful information on writing
231 :doc:`HowToSetUpLLVMStyleRTTI`
232 How to make ``isa<>``, ``dyn_cast<>``, etc. available for clients of your
236 Look here to see how to add instructions and intrinsics to LLVM.
238 `Doxygen generated documentation <http://llvm.org/doxygen/>`_
239 (`classes <http://llvm.org/doxygen/inherits.html>`_)
241 `Documentation for Go bindings <http://godoc.org/llvm.org/llvm/bindings/go/llvm>`_
243 `Github Source Repository Browser <http://github.com/llvm/llvm-project//>`_
246 :doc:`CompilerWriterInfo`
247 A list of helpful links for compiler writers.
250 A library for writing in-process guided fuzzers.
253 Information on writing and using Fuzzers to find bugs in LLVM.
255 :doc:`ScudoHardenedAllocator`
256 A library that implements a security-hardened `malloc()`.
259 A command line option for debugging optimization-induced failures.
261 .. _index-subsystem-docs:
263 Subsystem Documentation
264 =======================
266 For API clients and LLVM developers.
274 BlockFrequencyTerminology
279 AddingConstrainedIntrinsics
300 CoverageMappingFormat
314 SpeculativeLoadHardening
317 :doc:`WritingAnLLVMPass`
318 Information on how to write LLVM transformations and analyses.
320 :doc:`WritingAnLLVMBackend`
321 Information on how to write LLVM backends for machine targets.
324 The design and implementation of the LLVM code generator. Useful if you are
325 working on retargetting LLVM to a new architecture, designing a new codegen
326 pass, or enhancing existing components.
328 :doc:`Machine IR (MIR) Format Reference Manual <MIRLangRef>`
329 A reference manual for the MIR serialization format, which is used to test
330 LLVM's code generation passes.
332 :doc:`TableGen <TableGen/index>`
333 Describes the TableGen tool, which is used heavily by the LLVM code
337 Information on how to write a new alias analysis implementation or how to
338 use existing analyses.
341 Information about the MemorySSA utility in LLVM, as well as how to use it.
343 :doc:`GarbageCollection`
344 The interfaces source-language compilers should use for compiling GC'd
347 :doc:`Source Level Debugging with LLVM <SourceLevelDebugging>`
348 This document describes the design and philosophy behind the LLVM
349 source-level debugger.
352 This document describes the current status of vectorization in LLVM.
354 :doc:`ExceptionHandling`
355 This document describes the design and implementation of exception handling
358 :doc:`AddingConstrainedIntrinsics`
359 Gives the steps necessary when adding a new constrained math intrinsic
363 Automatic bug finder and test-case reducer description and usage
367 This describes the file format and encoding used for LLVM "bc" files.
369 :doc:`Support Library <SupportLibrary>`
370 This document describes the LLVM Support Library (``lib/Support``) and
371 how to keep LLVM source code portable
373 :doc:`LinkTimeOptimization`
374 This document describes the interface between LLVM intermodular optimizer
375 and the linker and its design
378 How to build your programs with link-time optimization on Linux.
380 :doc:`DebuggingJITedCode`
381 How to debug JITed code with GDB.
383 :doc:`MCJITDesignAndImplementation`
384 Describes the inner workings of MCJIT execution engine.
387 Describes the design and implementation of the ORC APIs, including some
388 usage examples, and a guide for users transitioning from ORCv1 to ORCv2.
390 :doc:`BranchWeightMetadata`
391 Provides information about Branch Prediction Information.
393 :doc:`BlockFrequencyTerminology`
394 Provides information about terminology used in the ``BlockFrequencyInfo``
397 :doc:`SegmentedStacks`
398 This document describes segmented stacks and how they are used in LLVM.
400 :doc:`MarkedUpDisassembly`
401 This document describes the optional rich disassembly output syntax.
403 :doc:`HowToUseAttributes`
404 Answers some questions about the new Attributes infrastructure.
407 This document describes using the NVPTX backend to compile GPU kernels.
410 This document describes using the AMDGPU backend to compile GPU kernels.
413 LLVM support for mapping instruction addresses to the location of
414 values and allowing code to be patched.
417 LLVM's support for generating NEON instructions on big endian ARM targets is
418 somewhat nonintuitive. This document explains the implementation and rationale.
420 :doc:`CoverageMappingFormat`
421 This describes the format and encoding used for LLVM’s code coverage mapping.
424 This describes a set of experimental extensions for garbage
427 :doc:`MergeFunctions`
428 Describes functions merging optimization.
431 Description of the ``inalloca`` argument attribute.
434 LLVM support for folding control flow into faulting machine instructions.
436 :doc:`CompileCudaWithLLVM`
437 LLVM support for CUDA.
440 LLVM support for coroutines.
443 This describes the prototype instruction selection replacement, GlobalISel.
446 High-level documentation of how to use XRay in LLVM.
449 An example of how to debug an application with XRay.
451 :doc:`The Microsoft PDB File Format <PDB/index>`
452 A detailed description of the Microsoft PDB (Program Database) file format.
455 A description of the verification tool for Control Flow Integrity.
457 :doc:`SpeculativeLoadHardening`
458 A description of the Speculative Load Hardening mitigation for Spectre v1.
460 :doc:`StackSafetyAnalysis`
461 This document describes the design of the stack safety analysis of local
464 Development Process Documentation
465 =================================
467 Information about LLVM's development process.
483 An overview on how to contribute to LLVM.
485 :doc:`DeveloperPolicy`
486 The LLVM project's policy towards developers and their contributions.
489 How-to guide and templates for new projects that *use* the LLVM
490 infrastructure. The templates (directory organization, Makefiles, and test
491 tree) allow the project code to be located outside (or inside) the ``llvm/``
492 tree, while using LLVM header files and libraries.
495 Describes the LLVMBuild organization and files used by LLVM to specify
496 component descriptions.
498 :doc:`HowToReleaseLLVM`
499 This is a guide to preparing LLVM releases. Most developers can ignore it.
501 :doc:`ReleaseProcess`
502 This is a guide to validate a new release, during the release process. Most developers can ignore it.
505 Advice on packaging LLVM into a distribution.
508 Describes how to use the Phabricator code review tool hosted on
509 http://reviews.llvm.org/ and its command line interface, Arcanist.
512 Describes how bugs are reported, triaged and closed.
517 LLVM has a thriving community of friendly and helpful developers.
518 The two primary communication mechanisms in the LLVM community are mailing
524 If you can't find what you need in these docs, try consulting the mailing
527 `Developer's List (llvm-dev)`__
528 This list is for people who want to be included in technical discussions of
529 LLVM. People post to this list when they have questions about writing code
530 for or using the LLVM tools. It is relatively low volume.
532 .. __: http://lists.llvm.org/mailman/listinfo/llvm-dev
534 `Commits Archive (llvm-commits)`__
535 This list contains all commit messages that are made when LLVM developers
536 commit code changes to the repository. It also serves as a forum for
537 patch review (i.e. send patches here). It is useful for those who want to
538 stay on the bleeding edge of LLVM development. This list is very high
541 .. __: http://lists.llvm.org/pipermail/llvm-commits/
543 `Bugs & Patches Archive (llvm-bugs)`__
544 This list gets emailed every time a bug is opened and closed. It is
545 higher volume than the LLVM-dev list.
547 .. __: http://lists.llvm.org/pipermail/llvm-bugs/
549 `Test Results Archive (llvm-testresults)`__
550 A message is automatically sent to this list by every active nightly tester
551 when it completes. As such, this list gets email several times each day,
552 making it a high volume list.
554 .. __: http://lists.llvm.org/pipermail/llvm-testresults/
556 `LLVM Announcements List (llvm-announce)`__
557 This is a low volume list that provides important announcements regarding
558 LLVM. It gets email about once a month.
560 .. __: http://lists.llvm.org/mailman/listinfo/llvm-announce
565 Users and developers of the LLVM project (including subprojects such as Clang)
566 can be found in #llvm on `irc.oftc.net <irc://irc.oftc.net/llvm>`_.
568 This channel has several bots.
572 * llvmbb - Bot for the main LLVM buildbot master.
573 http://lab.llvm.org:8011/console
574 * smooshlab - Apple's internal buildbot master.
576 * robot - Bugzilla linker. %bug <number>
578 * clang-bot - A `geordi <http://www.eelis.net/geordi/>`_ instance running
579 near-trunk clang instead of gcc.
581 Meetups and social events
582 -------------------------
589 Besides developer `meetings and conferences <https://llvm.org/devmtg/>`_,
590 there are several user groups called
591 `LLVM Socials <https://www.meetup.com/pro/llvm/>`_. We greatly encourage you to
592 join one in your city. Or start a new one if there is none:
594 :doc:`MeetupGuidelines`
596 Community wide proposals
597 ------------------------
599 Proposals for massive changes in how the community behaves and how the work flow
608 Proposals/VariableNames
609 Proposals/VectorizationPlan
612 Proposal to adopt a code of conduct on the LLVM social spaces (lists, events,
615 :doc:`Proposals/GitHubMove`
616 Proposal to move from SVN/Git to GitHub.
618 :doc:`Proposals/TestSuite`
619 Proposals for additional benchmarks/programs for llvm's test-suite.
621 :doc:`Proposals/VariableNames`
622 Proposal to change the variable names coding standard.
624 :doc:`Proposals/VectorizationPlan`
625 Proposal to model the process and upgrade the infrastructure of LLVM's Loop Vectorizer.