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
72 HowToCrossCompileBuiltinsOnArm
82 SphinxQuickstartTemplate
83 MarkdownQuickstartTemplate
91 Frontend/PerformanceTips
92 MCJITDesignAndImplementation
100 Discusses how to get up and running quickly with the LLVM infrastructure.
101 Everything from unpacking and compilation of the distribution to execution
105 An addendum to the main Getting Started guide for those using the `CMake
106 build system <http://www.cmake.org>`_.
108 :doc:`HowToBuildOnARM`
109 Notes on building and testing LLVM/Clang on ARM.
111 :doc:`HowToBuildWithPGO`
112 Notes on building LLVM/Clang with PGO.
114 :doc:`HowToCrossCompileBuiltinsOnArm`
115 Notes on cross-building and testing the compiler-rt builtins for Arm.
117 :doc:`HowToCrossCompileLLVM`
118 Notes on cross-building and testing LLVM/Clang.
120 :doc:`GettingStartedVS`
121 An addendum to the main Getting Started guide for those using Visual Studio
124 :doc:`tutorial/index`
125 Tutorials about using LLVM. Includes a tutorial about making a custom
128 :doc:`LLVM Command Guide <CommandGuide/index>`
129 A reference manual for the LLVM command line utilities ("man" pages for LLVM
133 A list of optimizations and analyses implemented in LLVM.
136 A list of common questions and problems and their solutions.
138 :doc:`Release notes for the current release <ReleaseNotes>`
139 This describes new features, known bugs, and other limitations.
141 :doc:`HowToSubmitABug`
142 Instructions for properly submitting information about any bugs you run into
145 :doc:`SphinxQuickstartTemplate`
146 A template + tutorial for writing new Sphinx documentation. It is meant
147 to be read in source form.
149 :doc:`LLVM Testing Infrastructure Guide <TestingGuide>`
150 A reference manual for using the LLVM testing infrastructure.
152 :doc:`TestSuiteGuide`
153 Describes how to compile and run the test-suite benchmarks.
155 `How to build the C, C++, ObjC, and ObjC++ front end`__
156 Instructions for building the clang front-end from source.
158 .. __: http://clang.llvm.org/get_started.html
161 Definition of acronyms, terms and concepts used in LLVM.
163 :doc:`HowToAddABuilder`
164 Instructions for adding new builder to LLVM buildbot master.
167 A reference guide for using LLVM's YAML I/O library.
170 Answers to some very frequent questions about LLVM's most frequently
171 misunderstood instruction.
173 :doc:`Frontend/PerformanceTips`
174 A collection of tips for frontend authors on how to generate IR
175 which LLVM is able to effectively optimize.
178 A reference for using Dockerfiles provided with LLVM.
181 Programming Documentation
182 =========================
184 For developers of applications which use LLVM as a library.
194 HowToSetUpLLVMStyleRTTI
199 ScudoHardenedAllocator
202 :doc:`LLVM Language Reference Manual <LangRef>`
203 Defines the LLVM intermediate representation and the assembly form of the
207 Information about LLVM's concurrency model.
209 :doc:`ProgrammersManual`
210 Introduction to the general layout of the LLVM sourcebase, important classes
211 and APIs, and some tips & tricks.
214 LLVM-specific extensions to tools and formats LLVM seeks compatibility with.
217 Provides information on using the command line parsing library.
219 :doc:`CodingStandards`
220 Details the LLVM coding standards and provides useful information on writing
223 :doc:`HowToSetUpLLVMStyleRTTI`
224 How to make ``isa<>``, ``dyn_cast<>``, etc. available for clients of your
228 Look here to see how to add instructions and intrinsics to LLVM.
230 `Doxygen generated documentation <http://llvm.org/doxygen/>`_
231 (`classes <http://llvm.org/doxygen/inherits.html>`_)
233 `Documentation for Go bindings <http://godoc.org/llvm.org/llvm/bindings/go/llvm>`_
235 `Github Source Repository Browser <http://github.com/llvm/llvm-project//>`_
238 :doc:`CompilerWriterInfo`
239 A list of helpful links for compiler writers.
242 A library for writing in-process guided fuzzers.
245 Information on writing and using Fuzzers to find bugs in LLVM.
247 :doc:`ScudoHardenedAllocator`
248 A library that implements a security-hardened `malloc()`.
251 A command line option for debugging optimization-induced failures.
253 .. _index-subsystem-docs:
255 Subsystem Documentation
256 =======================
258 For API clients and LLVM developers.
266 BlockFrequencyTerminology
291 CoverageMappingFormat
305 SpeculativeLoadHardening
308 :doc:`WritingAnLLVMPass`
309 Information on how to write LLVM transformations and analyses.
311 :doc:`WritingAnLLVMBackend`
312 Information on how to write LLVM backends for machine targets.
315 The design and implementation of the LLVM code generator. Useful if you are
316 working on retargetting LLVM to a new architecture, designing a new codegen
317 pass, or enhancing existing components.
319 :doc:`Machine IR (MIR) Format Reference Manual <MIRLangRef>`
320 A reference manual for the MIR serialization format, which is used to test
321 LLVM's code generation passes.
323 :doc:`TableGen <TableGen/index>`
324 Describes the TableGen tool, which is used heavily by the LLVM code
328 Information on how to write a new alias analysis implementation or how to
329 use existing analyses.
332 Information about the MemorySSA utility in LLVM, as well as how to use it.
334 :doc:`GarbageCollection`
335 The interfaces source-language compilers should use for compiling GC'd
338 :doc:`Source Level Debugging with LLVM <SourceLevelDebugging>`
339 This document describes the design and philosophy behind the LLVM
340 source-level debugger.
343 This document describes the current status of vectorization in LLVM.
345 :doc:`ExceptionHandling`
346 This document describes the design and implementation of exception handling
350 Automatic bug finder and test-case reducer description and usage
354 This describes the file format and encoding used for LLVM "bc" files.
356 :doc:`Support Library <SupportLibrary>`
357 This document describes the LLVM Support Library (``lib/Support``) and
358 how to keep LLVM source code portable
360 :doc:`LinkTimeOptimization`
361 This document describes the interface between LLVM intermodular optimizer
362 and the linker and its design
365 How to build your programs with link-time optimization on Linux.
367 :doc:`DebuggingJITedCode`
368 How to debug JITed code with GDB.
370 :doc:`MCJITDesignAndImplementation`
371 Describes the inner workings of MCJIT execution engine.
373 :doc:`BranchWeightMetadata`
374 Provides information about Branch Prediction Information.
376 :doc:`BlockFrequencyTerminology`
377 Provides information about terminology used in the ``BlockFrequencyInfo``
380 :doc:`SegmentedStacks`
381 This document describes segmented stacks and how they are used in LLVM.
383 :doc:`MarkedUpDisassembly`
384 This document describes the optional rich disassembly output syntax.
386 :doc:`HowToUseAttributes`
387 Answers some questions about the new Attributes infrastructure.
390 This document describes using the NVPTX backend to compile GPU kernels.
393 This document describes using the AMDGPU backend to compile GPU kernels.
396 LLVM support for mapping instruction addresses to the location of
397 values and allowing code to be patched.
400 LLVM's support for generating NEON instructions on big endian ARM targets is
401 somewhat nonintuitive. This document explains the implementation and rationale.
403 :doc:`CoverageMappingFormat`
404 This describes the format and encoding used for LLVM’s code coverage mapping.
407 This describes a set of experimental extensions for garbage
410 :doc:`MergeFunctions`
411 Describes functions merging optimization.
414 Description of the ``inalloca`` argument attribute.
417 LLVM support for folding control flow into faulting machine instructions.
419 :doc:`CompileCudaWithLLVM`
420 LLVM support for CUDA.
423 LLVM support for coroutines.
426 This describes the prototype instruction selection replacement, GlobalISel.
429 High-level documentation of how to use XRay in LLVM.
432 An example of how to debug an application with XRay.
434 :doc:`The Microsoft PDB File Format <PDB/index>`
435 A detailed description of the Microsoft PDB (Program Database) file format.
438 A description of the verification tool for Control Flow Integrity.
440 :doc:`SpeculativeLoadHardening`
441 A description of the Speculative Load Hardening mitigation for Spectre v1.
443 :doc:`StackSafetyAnalysis`
444 This document describes the design of the stack safety analysis of local
447 Development Process Documentation
448 =================================
450 Information about LLVM's development process.
466 An overview on how to contribute to LLVM.
468 :doc:`DeveloperPolicy`
469 The LLVM project's policy towards developers and their contributions.
472 How-to guide and templates for new projects that *use* the LLVM
473 infrastructure. The templates (directory organization, Makefiles, and test
474 tree) allow the project code to be located outside (or inside) the ``llvm/``
475 tree, while using LLVM header files and libraries.
478 Describes the LLVMBuild organization and files used by LLVM to specify
479 component descriptions.
481 :doc:`HowToReleaseLLVM`
482 This is a guide to preparing LLVM releases. Most developers can ignore it.
484 :doc:`ReleaseProcess`
485 This is a guide to validate a new release, during the release process. Most developers can ignore it.
488 Advice on packaging LLVM into a distribution.
491 Describes how to use the Phabricator code review tool hosted on
492 http://reviews.llvm.org/ and its command line interface, Arcanist.
495 Describes how bugs are reported, triaged and closed.
500 LLVM has a thriving community of friendly and helpful developers.
501 The two primary communication mechanisms in the LLVM community are mailing
507 If you can't find what you need in these docs, try consulting the mailing
510 `Developer's List (llvm-dev)`__
511 This list is for people who want to be included in technical discussions of
512 LLVM. People post to this list when they have questions about writing code
513 for or using the LLVM tools. It is relatively low volume.
515 .. __: http://lists.llvm.org/mailman/listinfo/llvm-dev
517 `Commits Archive (llvm-commits)`__
518 This list contains all commit messages that are made when LLVM developers
519 commit code changes to the repository. It also serves as a forum for
520 patch review (i.e. send patches here). It is useful for those who want to
521 stay on the bleeding edge of LLVM development. This list is very high
524 .. __: http://lists.llvm.org/pipermail/llvm-commits/
526 `Bugs & Patches Archive (llvm-bugs)`__
527 This list gets emailed every time a bug is opened and closed. It is
528 higher volume than the LLVM-dev list.
530 .. __: http://lists.llvm.org/pipermail/llvm-bugs/
532 `Test Results Archive (llvm-testresults)`__
533 A message is automatically sent to this list by every active nightly tester
534 when it completes. As such, this list gets email several times each day,
535 making it a high volume list.
537 .. __: http://lists.llvm.org/pipermail/llvm-testresults/
539 `LLVM Announcements List (llvm-announce)`__
540 This is a low volume list that provides important announcements regarding
541 LLVM. It gets email about once a month.
543 .. __: http://lists.llvm.org/mailman/listinfo/llvm-announce
548 Users and developers of the LLVM project (including subprojects such as Clang)
549 can be found in #llvm on `irc.oftc.net <irc://irc.oftc.net/llvm>`_.
551 This channel has several bots.
555 * llvmbb - Bot for the main LLVM buildbot master.
556 http://lab.llvm.org:8011/console
557 * bb-chapuni - An individually run buildbot master. http://bb.pgr.jp/console
558 * smooshlab - Apple's internal buildbot master.
560 * robot - Bugzilla linker. %bug <number>
562 * clang-bot - A `geordi <http://www.eelis.net/geordi/>`_ instance running
563 near-trunk clang instead of gcc.
565 Community wide proposals
566 ------------------------
568 Proposals for massive changes in how the community behaves and how the work flow
577 Proposals/VectorizationPlan
580 Proposal to adopt a code of conduct on the LLVM social spaces (lists, events,
583 :doc:`Proposals/GitHubMove`
584 Proposal to move from SVN/Git to GitHub.
586 :doc:`Proposals/TestSuite`
587 Proposals for additional benchmarks/programs for llvm's test-suite.
589 :doc:`Proposals/VectorizationPlan`
590 Proposal to model the process and upgrade the infrastructure of LLVM's Loop Vectorizer.