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
92 ORCv2DesignAndImplementation
100 :doc:`GettingStarted`
101 Discusses how to get up and running quickly with the LLVM infrastructure.
102 Everything from unpacking and compilation of the distribution to execution
106 An addendum to the main Getting Started guide for those using the `CMake
107 build system <http://www.cmake.org>`_.
109 :doc:`HowToBuildOnARM`
110 Notes on building and testing LLVM/Clang on ARM.
112 :doc:`HowToBuildWithPGO`
113 Notes on building LLVM/Clang with PGO.
115 :doc:`HowToCrossCompileBuiltinsOnArm`
116 Notes on cross-building and testing the compiler-rt builtins for Arm.
118 :doc:`HowToCrossCompileLLVM`
119 Notes on cross-building and testing LLVM/Clang.
121 :doc:`GettingStartedVS`
122 An addendum to the main Getting Started guide for those using Visual Studio
125 :doc:`tutorial/index`
126 Tutorials about using LLVM. Includes a tutorial about making a custom
129 :doc:`LLVM Command Guide <CommandGuide/index>`
130 A reference manual for the LLVM command line utilities ("man" pages for LLVM
134 A list of optimizations and analyses implemented in LLVM.
137 A list of common questions and problems and their solutions.
139 :doc:`Release notes for the current release <ReleaseNotes>`
140 This describes new features, known bugs, and other limitations.
142 :doc:`HowToSubmitABug`
143 Instructions for properly submitting information about any bugs you run into
146 :doc:`SphinxQuickstartTemplate`
147 A template + tutorial for writing new Sphinx documentation. It is meant
148 to be read in source form.
150 :doc:`LLVM Testing Infrastructure Guide <TestingGuide>`
151 A reference manual for using the LLVM testing infrastructure.
153 :doc:`TestSuiteGuide`
154 Describes how to compile and run the test-suite benchmarks.
156 `How to build the C, C++, ObjC, and ObjC++ front end`__
157 Instructions for building the clang front-end from source.
159 .. __: http://clang.llvm.org/get_started.html
162 Definition of acronyms, terms and concepts used in LLVM.
164 :doc:`HowToAddABuilder`
165 Instructions for adding new builder to LLVM buildbot master.
168 A reference guide for using LLVM's YAML I/O library.
171 Answers to some very frequent questions about LLVM's most frequently
172 misunderstood instruction.
174 :doc:`Frontend/PerformanceTips`
175 A collection of tips for frontend authors on how to generate IR
176 which LLVM is able to effectively optimize.
179 A reference for using Dockerfiles provided with LLVM.
181 :doc:`BuildingADistribution`
182 A best-practices guide for using LLVM's CMake build system to package and
183 distribute LLVM-based tools.
186 Programming Documentation
187 =========================
189 For developers of applications which use LLVM as a library.
199 HowToSetUpLLVMStyleRTTI
204 ScudoHardenedAllocator
207 :doc:`LLVM Language Reference Manual <LangRef>`
208 Defines the LLVM intermediate representation and the assembly form of the
212 Information about LLVM's concurrency model.
214 :doc:`ProgrammersManual`
215 Introduction to the general layout of the LLVM sourcebase, important classes
216 and APIs, and some tips & tricks.
219 LLVM-specific extensions to tools and formats LLVM seeks compatibility with.
222 Provides information on using the command line parsing library.
224 :doc:`CodingStandards`
225 Details the LLVM coding standards and provides useful information on writing
228 :doc:`HowToSetUpLLVMStyleRTTI`
229 How to make ``isa<>``, ``dyn_cast<>``, etc. available for clients of your
233 Look here to see how to add instructions and intrinsics to LLVM.
235 `Doxygen generated documentation <http://llvm.org/doxygen/>`_
236 (`classes <http://llvm.org/doxygen/inherits.html>`_)
238 `Documentation for Go bindings <http://godoc.org/llvm.org/llvm/bindings/go/llvm>`_
240 `Github Source Repository Browser <http://github.com/llvm/llvm-project//>`_
243 :doc:`CompilerWriterInfo`
244 A list of helpful links for compiler writers.
247 A library for writing in-process guided fuzzers.
250 Information on writing and using Fuzzers to find bugs in LLVM.
252 :doc:`ScudoHardenedAllocator`
253 A library that implements a security-hardened `malloc()`.
256 A command line option for debugging optimization-induced failures.
258 .. _index-subsystem-docs:
260 Subsystem Documentation
261 =======================
263 For API clients and LLVM developers.
271 BlockFrequencyTerminology
276 AddingConstrainedIntrinsics
297 CoverageMappingFormat
311 SpeculativeLoadHardening
314 :doc:`WritingAnLLVMPass`
315 Information on how to write LLVM transformations and analyses.
317 :doc:`WritingAnLLVMBackend`
318 Information on how to write LLVM backends for machine targets.
321 The design and implementation of the LLVM code generator. Useful if you are
322 working on retargetting LLVM to a new architecture, designing a new codegen
323 pass, or enhancing existing components.
325 :doc:`Machine IR (MIR) Format Reference Manual <MIRLangRef>`
326 A reference manual for the MIR serialization format, which is used to test
327 LLVM's code generation passes.
329 :doc:`TableGen <TableGen/index>`
330 Describes the TableGen tool, which is used heavily by the LLVM code
334 Information on how to write a new alias analysis implementation or how to
335 use existing analyses.
338 Information about the MemorySSA utility in LLVM, as well as how to use it.
340 :doc:`GarbageCollection`
341 The interfaces source-language compilers should use for compiling GC'd
344 :doc:`Source Level Debugging with LLVM <SourceLevelDebugging>`
345 This document describes the design and philosophy behind the LLVM
346 source-level debugger.
349 This document describes the current status of vectorization in LLVM.
351 :doc:`ExceptionHandling`
352 This document describes the design and implementation of exception handling
355 :doc:`AddingConstrainedIntrinsics`
356 Gives the steps necessary when adding a new constrained math intrinsic
360 Automatic bug finder and test-case reducer description and usage
364 This describes the file format and encoding used for LLVM "bc" files.
366 :doc:`Support Library <SupportLibrary>`
367 This document describes the LLVM Support Library (``lib/Support``) and
368 how to keep LLVM source code portable
370 :doc:`LinkTimeOptimization`
371 This document describes the interface between LLVM intermodular optimizer
372 and the linker and its design
375 How to build your programs with link-time optimization on Linux.
377 :doc:`DebuggingJITedCode`
378 How to debug JITed code with GDB.
380 :doc:`MCJITDesignAndImplementation`
381 Describes the inner workings of MCJIT execution engine.
383 :doc:`ORCv2DesignAndImplementation`
384 Describes the design and implementation of the ORC APIs, including some
387 :doc:`BranchWeightMetadata`
388 Provides information about Branch Prediction Information.
390 :doc:`BlockFrequencyTerminology`
391 Provides information about terminology used in the ``BlockFrequencyInfo``
394 :doc:`SegmentedStacks`
395 This document describes segmented stacks and how they are used in LLVM.
397 :doc:`MarkedUpDisassembly`
398 This document describes the optional rich disassembly output syntax.
400 :doc:`HowToUseAttributes`
401 Answers some questions about the new Attributes infrastructure.
404 This document describes using the NVPTX backend to compile GPU kernels.
407 This document describes using the AMDGPU backend to compile GPU kernels.
410 LLVM support for mapping instruction addresses to the location of
411 values and allowing code to be patched.
414 LLVM's support for generating NEON instructions on big endian ARM targets is
415 somewhat nonintuitive. This document explains the implementation and rationale.
417 :doc:`CoverageMappingFormat`
418 This describes the format and encoding used for LLVM’s code coverage mapping.
421 This describes a set of experimental extensions for garbage
424 :doc:`MergeFunctions`
425 Describes functions merging optimization.
428 Description of the ``inalloca`` argument attribute.
431 LLVM support for folding control flow into faulting machine instructions.
433 :doc:`CompileCudaWithLLVM`
434 LLVM support for CUDA.
437 LLVM support for coroutines.
440 This describes the prototype instruction selection replacement, GlobalISel.
443 High-level documentation of how to use XRay in LLVM.
446 An example of how to debug an application with XRay.
448 :doc:`The Microsoft PDB File Format <PDB/index>`
449 A detailed description of the Microsoft PDB (Program Database) file format.
452 A description of the verification tool for Control Flow Integrity.
454 :doc:`SpeculativeLoadHardening`
455 A description of the Speculative Load Hardening mitigation for Spectre v1.
457 :doc:`StackSafetyAnalysis`
458 This document describes the design of the stack safety analysis of local
461 Development Process Documentation
462 =================================
464 Information about LLVM's development process.
480 An overview on how to contribute to LLVM.
482 :doc:`DeveloperPolicy`
483 The LLVM project's policy towards developers and their contributions.
486 How-to guide and templates for new projects that *use* the LLVM
487 infrastructure. The templates (directory organization, Makefiles, and test
488 tree) allow the project code to be located outside (or inside) the ``llvm/``
489 tree, while using LLVM header files and libraries.
492 Describes the LLVMBuild organization and files used by LLVM to specify
493 component descriptions.
495 :doc:`HowToReleaseLLVM`
496 This is a guide to preparing LLVM releases. Most developers can ignore it.
498 :doc:`ReleaseProcess`
499 This is a guide to validate a new release, during the release process. Most developers can ignore it.
502 Advice on packaging LLVM into a distribution.
505 Describes how to use the Phabricator code review tool hosted on
506 http://reviews.llvm.org/ and its command line interface, Arcanist.
509 Describes how bugs are reported, triaged and closed.
514 LLVM has a thriving community of friendly and helpful developers.
515 The two primary communication mechanisms in the LLVM community are mailing
521 If you can't find what you need in these docs, try consulting the mailing
524 `Developer's List (llvm-dev)`__
525 This list is for people who want to be included in technical discussions of
526 LLVM. People post to this list when they have questions about writing code
527 for or using the LLVM tools. It is relatively low volume.
529 .. __: http://lists.llvm.org/mailman/listinfo/llvm-dev
531 `Commits Archive (llvm-commits)`__
532 This list contains all commit messages that are made when LLVM developers
533 commit code changes to the repository. It also serves as a forum for
534 patch review (i.e. send patches here). It is useful for those who want to
535 stay on the bleeding edge of LLVM development. This list is very high
538 .. __: http://lists.llvm.org/pipermail/llvm-commits/
540 `Bugs & Patches Archive (llvm-bugs)`__
541 This list gets emailed every time a bug is opened and closed. It is
542 higher volume than the LLVM-dev list.
544 .. __: http://lists.llvm.org/pipermail/llvm-bugs/
546 `Test Results Archive (llvm-testresults)`__
547 A message is automatically sent to this list by every active nightly tester
548 when it completes. As such, this list gets email several times each day,
549 making it a high volume list.
551 .. __: http://lists.llvm.org/pipermail/llvm-testresults/
553 `LLVM Announcements List (llvm-announce)`__
554 This is a low volume list that provides important announcements regarding
555 LLVM. It gets email about once a month.
557 .. __: http://lists.llvm.org/mailman/listinfo/llvm-announce
562 Users and developers of the LLVM project (including subprojects such as Clang)
563 can be found in #llvm on `irc.oftc.net <irc://irc.oftc.net/llvm>`_.
565 This channel has several bots.
569 * llvmbb - Bot for the main LLVM buildbot master.
570 http://lab.llvm.org:8011/console
571 * smooshlab - Apple's internal buildbot master.
573 * robot - Bugzilla linker. %bug <number>
575 * clang-bot - A `geordi <http://www.eelis.net/geordi/>`_ instance running
576 near-trunk clang instead of gcc.
578 Meetups and social events
579 -------------------------
586 Besides developer `meetings and conferences <https://llvm.org/devmtg/>`_,
587 there are several user groups called
588 `LLVM Socials <https://www.meetup.com/pro/llvm/>`_. We greatly encourage you to
589 join one in your city. Or start a new one if there is none:
591 :doc:`MeetupGuidelines`
593 Community wide proposals
594 ------------------------
596 Proposals for massive changes in how the community behaves and how the work flow
605 Proposals/VariableNames
606 Proposals/VectorizationPlan
609 Proposal to adopt a code of conduct on the LLVM social spaces (lists, events,
612 :doc:`Proposals/GitHubMove`
613 Proposal to move from SVN/Git to GitHub.
615 :doc:`Proposals/TestSuite`
616 Proposals for additional benchmarks/programs for llvm's test-suite.
618 :doc:`Proposals/VariableNames`
619 Proposal to change the variable names coding standard.
621 :doc:`Proposals/VectorizationPlan`
622 Proposal to model the process and upgrade the infrastructure of LLVM's Loop Vectorizer.