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
211 :doc:`LLVM Language Reference Manual <LangRef>`
212 Defines the LLVM intermediate representation and the assembly form of the
216 Information about LLVM's concurrency model.
218 :doc:`ProgrammersManual`
219 Introduction to the general layout of the LLVM sourcebase, important classes
220 and APIs, and some tips & tricks.
223 LLVM-specific extensions to tools and formats LLVM seeks compatibility with.
226 Provides information on using the command line parsing library.
228 :doc:`CodingStandards`
229 Details the LLVM coding standards and provides useful information on writing
232 :doc:`HowToSetUpLLVMStyleRTTI`
233 How to make ``isa<>``, ``dyn_cast<>``, etc. available for clients of your
237 Look here to see how to add instructions and intrinsics to LLVM.
239 `Doxygen generated documentation <http://llvm.org/doxygen/>`_
240 (`classes <http://llvm.org/doxygen/inherits.html>`_)
242 `Documentation for Go bindings <http://godoc.org/llvm.org/llvm/bindings/go/llvm>`_
244 `Github Source Repository Browser <http://github.com/llvm/llvm-project//>`_
247 :doc:`CompilerWriterInfo`
248 A list of helpful links for compiler writers.
251 A library for writing in-process guided fuzzers.
254 Information on writing and using Fuzzers to find bugs in LLVM.
256 :doc:`ScudoHardenedAllocator`
257 A library that implements a security-hardened `malloc()`.
260 A command line option for debugging optimization-induced failures.
263 A sampled heap memory error detection toolkit designed for production use.
265 .. _index-subsystem-docs:
267 Subsystem Documentation
268 =======================
270 For API clients and LLVM developers.
278 BlockFrequencyTerminology
284 AddingConstrainedIntrinsics
305 CoverageMappingFormat
319 SpeculativeLoadHardening
323 :doc:`WritingAnLLVMPass`
324 Information on how to write LLVM transformations and analyses.
326 :doc:`WritingAnLLVMBackend`
327 Information on how to write LLVM backends for machine targets.
330 The design and implementation of the LLVM code generator. Useful if you are
331 working on retargetting LLVM to a new architecture, designing a new codegen
332 pass, or enhancing existing components.
334 :doc:`Machine IR (MIR) Format Reference Manual <MIRLangRef>`
335 A reference manual for the MIR serialization format, which is used to test
336 LLVM's code generation passes.
338 :doc:`TableGen <TableGen/index>`
339 Describes the TableGen tool, which is used heavily by the LLVM code
343 Information on how to write a new alias analysis implementation or how to
344 use existing analyses.
347 Information about the MemorySSA utility in LLVM, as well as how to use it.
349 :doc:`GarbageCollection`
350 The interfaces source-language compilers should use for compiling GC'd
353 :doc:`Source Level Debugging with LLVM <SourceLevelDebugging>`
354 This document describes the design and philosophy behind the LLVM
355 source-level debugger.
358 This document describes the current status of vectorization in LLVM.
360 :doc:`ExceptionHandling`
361 This document describes the design and implementation of exception handling
364 :doc:`AddingConstrainedIntrinsics`
365 Gives the steps necessary when adding a new constrained math intrinsic
369 Automatic bug finder and test-case reducer description and usage
372 :doc:`BugpointRedesign`
373 Design doc for a redesign of the Bugpoint tool.
376 This describes the file format and encoding used for LLVM "bc" files.
378 :doc:`Support Library <SupportLibrary>`
379 This document describes the LLVM Support Library (``lib/Support``) and
380 how to keep LLVM source code portable
382 :doc:`LinkTimeOptimization`
383 This document describes the interface between LLVM intermodular optimizer
384 and the linker and its design
387 How to build your programs with link-time optimization on Linux.
389 :doc:`DebuggingJITedCode`
390 How to debug JITed code with GDB.
392 :doc:`MCJITDesignAndImplementation`
393 Describes the inner workings of MCJIT execution engine.
396 Describes the design and implementation of the ORC APIs, including some
397 usage examples, and a guide for users transitioning from ORCv1 to ORCv2.
399 :doc:`BranchWeightMetadata`
400 Provides information about Branch Prediction Information.
402 :doc:`BlockFrequencyTerminology`
403 Provides information about terminology used in the ``BlockFrequencyInfo``
406 :doc:`SegmentedStacks`
407 This document describes segmented stacks and how they are used in LLVM.
409 :doc:`MarkedUpDisassembly`
410 This document describes the optional rich disassembly output syntax.
412 :doc:`HowToUseAttributes`
413 Answers some questions about the new Attributes infrastructure.
416 This document describes using the NVPTX backend to compile GPU kernels.
419 This document describes using the AMDGPU backend to compile GPU kernels.
422 LLVM support for mapping instruction addresses to the location of
423 values and allowing code to be patched.
426 LLVM's support for generating NEON instructions on big endian ARM targets is
427 somewhat nonintuitive. This document explains the implementation and rationale.
429 :doc:`CoverageMappingFormat`
430 This describes the format and encoding used for LLVM’s code coverage mapping.
433 This describes a set of experimental extensions for garbage
436 :doc:`MergeFunctions`
437 Describes functions merging optimization.
440 Description of the ``inalloca`` argument attribute.
443 LLVM support for folding control flow into faulting machine instructions.
445 :doc:`CompileCudaWithLLVM`
446 LLVM support for CUDA.
449 LLVM support for coroutines.
452 This describes the prototype instruction selection replacement, GlobalISel.
455 High-level documentation of how to use XRay in LLVM.
458 An example of how to debug an application with XRay.
460 :doc:`The Microsoft PDB File Format <PDB/index>`
461 A detailed description of the Microsoft PDB (Program Database) file format.
464 A description of the verification tool for Control Flow Integrity.
466 :doc:`SpeculativeLoadHardening`
467 A description of the Speculative Load Hardening mitigation for Spectre v1.
469 :doc:`StackSafetyAnalysis`
470 This document describes the design of the stack safety analysis of local
473 :doc:`LoopTerminology`
474 A document describing Loops and associated terms as used in LLVM.
476 Development Process Documentation
477 =================================
479 Information about LLVM's development process.
495 An overview on how to contribute to LLVM.
497 :doc:`DeveloperPolicy`
498 The LLVM project's policy towards developers and their contributions.
501 How-to guide and templates for new projects that *use* the LLVM
502 infrastructure. The templates (directory organization, Makefiles, and test
503 tree) allow the project code to be located outside (or inside) the ``llvm/``
504 tree, while using LLVM header files and libraries.
507 Describes the LLVMBuild organization and files used by LLVM to specify
508 component descriptions.
510 :doc:`HowToReleaseLLVM`
511 This is a guide to preparing LLVM releases. Most developers can ignore it.
513 :doc:`ReleaseProcess`
514 This is a guide to validate a new release, during the release process. Most developers can ignore it.
517 Advice on packaging LLVM into a distribution.
520 Describes how to use the Phabricator code review tool hosted on
521 http://reviews.llvm.org/ and its command line interface, Arcanist.
524 Describes how bugs are reported, triaged and closed.
529 LLVM has a thriving community of friendly and helpful developers.
530 The two primary communication mechanisms in the LLVM community are mailing
536 If you can't find what you need in these docs, try consulting the mailing
539 `Developer's List (llvm-dev)`__
540 This list is for people who want to be included in technical discussions of
541 LLVM. People post to this list when they have questions about writing code
542 for or using the LLVM tools. It is relatively low volume.
544 .. __: http://lists.llvm.org/mailman/listinfo/llvm-dev
546 `Commits Archive (llvm-commits)`__
547 This list contains all commit messages that are made when LLVM developers
548 commit code changes to the repository. It also serves as a forum for
549 patch review (i.e. send patches here). It is useful for those who want to
550 stay on the bleeding edge of LLVM development. This list is very high
553 .. __: http://lists.llvm.org/pipermail/llvm-commits/
555 `Bugs & Patches Archive (llvm-bugs)`__
556 This list gets emailed every time a bug is opened and closed. It is
557 higher volume than the LLVM-dev list.
559 .. __: http://lists.llvm.org/pipermail/llvm-bugs/
561 `Test Results Archive (llvm-testresults)`__
562 A message is automatically sent to this list by every active nightly tester
563 when it completes. As such, this list gets email several times each day,
564 making it a high volume list.
566 .. __: http://lists.llvm.org/pipermail/llvm-testresults/
568 `LLVM Announcements List (llvm-announce)`__
569 This is a low volume list that provides important announcements regarding
570 LLVM. It gets email about once a month.
572 .. __: http://lists.llvm.org/mailman/listinfo/llvm-announce
577 Users and developers of the LLVM project (including subprojects such as Clang)
578 can be found in #llvm on `irc.oftc.net <irc://irc.oftc.net/llvm>`_.
580 This channel has several bots.
584 * llvmbb - Bot for the main LLVM buildbot master.
585 http://lab.llvm.org:8011/console
586 * smooshlab - Apple's internal buildbot master.
588 * robot - Bugzilla linker. %bug <number>
590 * clang-bot - A `geordi <http://www.eelis.net/geordi/>`_ instance running
591 near-trunk clang instead of gcc.
593 Meetups and social events
594 -------------------------
601 Besides developer `meetings and conferences <https://llvm.org/devmtg/>`_,
602 there are several user groups called
603 `LLVM Socials <https://www.meetup.com/pro/llvm/>`_. We greatly encourage you to
604 join one in your city. Or start a new one if there is none:
606 :doc:`MeetupGuidelines`
608 Community wide proposals
609 ------------------------
611 Proposals for massive changes in how the community behaves and how the work flow
621 Proposals/VariableNames
622 Proposals/VectorizationPlan
625 Proposal to adopt a code of conduct on the LLVM social spaces (lists, events,
628 :doc:`Proposals/GitHubMove`
629 Proposal to move from SVN/Git to GitHub.
631 :doc:`Proposals/LLVMLibC`
632 Proposal to add a libc implementation under the LLVM project.
634 :doc:`Proposals/TestSuite`
635 Proposals for additional benchmarks/programs for llvm's test-suite.
637 :doc:`Proposals/VariableNames`
638 Proposal to change the variable names coding standard.
640 :doc:`Proposals/VectorizationPlan`
641 Proposal to model the process and upgrade the infrastructure of LLVM's Loop Vectorizer.