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
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:`HowToBuildWithPGO`
111 Notes on building LLVM/Clang with PGO.
113 :doc:`HowToCrossCompileBuiltinsOnArm`
114 Notes on cross-building and testing the compiler-rt builtins for Arm.
116 :doc:`HowToCrossCompileLLVM`
117 Notes on cross-building and testing LLVM/Clang.
119 :doc:`GettingStartedVS`
120 An addendum to the main Getting Started guide for those using Visual Studio
123 :doc:`tutorial/index`
124 Tutorials about using LLVM. Includes a tutorial about making a custom
127 :doc:`LLVM Command Guide <CommandGuide/index>`
128 A reference manual for the LLVM command line utilities ("man" pages for LLVM
132 A list of optimizations and analyses implemented in LLVM.
135 A list of common questions and problems and their solutions.
137 :doc:`Release notes for the current release <ReleaseNotes>`
138 This describes new features, known bugs, and other limitations.
140 :doc:`HowToSubmitABug`
141 Instructions for properly submitting information about any bugs you run into
144 :doc:`SphinxQuickstartTemplate`
145 A template + tutorial for writing new Sphinx documentation. It is meant
146 to be read in source form.
148 :doc:`LLVM Testing Infrastructure Guide <TestingGuide>`
149 A reference manual for using the LLVM testing infrastructure.
151 :doc:`TestSuiteGuide`
152 Describes how to compile and run the test-suite benchmarks.
154 `How to build the C, C++, ObjC, and ObjC++ front end`__
155 Instructions for building the clang front-end from source.
157 .. __: http://clang.llvm.org/get_started.html
160 Definition of acronyms, terms and concepts used in LLVM.
162 :doc:`HowToAddABuilder`
163 Instructions for adding new builder to LLVM buildbot master.
166 A reference guide for using LLVM's YAML I/O library.
169 Answers to some very frequent questions about LLVM's most frequently
170 misunderstood instruction.
172 :doc:`Frontend/PerformanceTips`
173 A collection of tips for frontend authors on how to generate IR
174 which LLVM is able to effectively optimize.
177 A reference for using Dockerfiles provided with LLVM.
180 Programming Documentation
181 =========================
183 For developers of applications which use LLVM as a library.
193 HowToSetUpLLVMStyleRTTI
198 ScudoHardenedAllocator
201 :doc:`LLVM Language Reference Manual <LangRef>`
202 Defines the LLVM intermediate representation and the assembly form of the
206 Information about LLVM's concurrency model.
208 :doc:`ProgrammersManual`
209 Introduction to the general layout of the LLVM sourcebase, important classes
210 and APIs, and some tips & tricks.
213 LLVM-specific extensions to tools and formats LLVM seeks compatibility with.
216 Provides information on using the command line parsing library.
218 :doc:`CodingStandards`
219 Details the LLVM coding standards and provides useful information on writing
222 :doc:`HowToSetUpLLVMStyleRTTI`
223 How to make ``isa<>``, ``dyn_cast<>``, etc. available for clients of your
227 Look here to see how to add instructions and intrinsics to LLVM.
229 `Doxygen generated documentation <http://llvm.org/doxygen/>`_
230 (`classes <http://llvm.org/doxygen/inherits.html>`_)
232 `Documentation for Go bindings <http://godoc.org/llvm.org/llvm/bindings/go/llvm>`_
234 `Github Source Repository Browser <http://github.com/llvm/llvm-project//>`_
237 :doc:`CompilerWriterInfo`
238 A list of helpful links for compiler writers.
241 A library for writing in-process guided fuzzers.
244 Information on writing and using Fuzzers to find bugs in LLVM.
246 :doc:`ScudoHardenedAllocator`
247 A library that implements a security-hardened `malloc()`.
250 A command line option for debugging optimization-induced failures.
252 .. _index-subsystem-docs:
254 Subsystem Documentation
255 =======================
257 For API clients and LLVM developers.
265 BlockFrequencyTerminology
290 CoverageMappingFormat
304 SpeculativeLoadHardening
307 :doc:`WritingAnLLVMPass`
308 Information on how to write LLVM transformations and analyses.
310 :doc:`WritingAnLLVMBackend`
311 Information on how to write LLVM backends for machine targets.
314 The design and implementation of the LLVM code generator. Useful if you are
315 working on retargetting LLVM to a new architecture, designing a new codegen
316 pass, or enhancing existing components.
318 :doc:`Machine IR (MIR) Format Reference Manual <MIRLangRef>`
319 A reference manual for the MIR serialization format, which is used to test
320 LLVM's code generation passes.
322 :doc:`TableGen <TableGen/index>`
323 Describes the TableGen tool, which is used heavily by the LLVM code
327 Information on how to write a new alias analysis implementation or how to
328 use existing analyses.
331 Information about the MemorySSA utility in LLVM, as well as how to use it.
333 :doc:`GarbageCollection`
334 The interfaces source-language compilers should use for compiling GC'd
337 :doc:`Source Level Debugging with LLVM <SourceLevelDebugging>`
338 This document describes the design and philosophy behind the LLVM
339 source-level debugger.
342 This document describes the current status of vectorization in LLVM.
344 :doc:`ExceptionHandling`
345 This document describes the design and implementation of exception handling
349 Automatic bug finder and test-case reducer description and usage
353 This describes the file format and encoding used for LLVM "bc" files.
355 :doc:`Support Library <SupportLibrary>`
356 This document describes the LLVM Support Library (``lib/Support``) and
357 how to keep LLVM source code portable
359 :doc:`LinkTimeOptimization`
360 This document describes the interface between LLVM intermodular optimizer
361 and the linker and its design
364 How to build your programs with link-time optimization on Linux.
366 :doc:`DebuggingJITedCode`
367 How to debug JITed code with GDB.
369 :doc:`MCJITDesignAndImplementation`
370 Describes the inner workings of MCJIT execution engine.
372 :doc:`BranchWeightMetadata`
373 Provides information about Branch Prediction Information.
375 :doc:`BlockFrequencyTerminology`
376 Provides information about terminology used in the ``BlockFrequencyInfo``
379 :doc:`SegmentedStacks`
380 This document describes segmented stacks and how they are used in LLVM.
382 :doc:`MarkedUpDisassembly`
383 This document describes the optional rich disassembly output syntax.
385 :doc:`HowToUseAttributes`
386 Answers some questions about the new Attributes infrastructure.
389 This document describes using the NVPTX backend to compile GPU kernels.
392 This document describes using the AMDGPU backend to compile GPU kernels.
395 LLVM support for mapping instruction addresses to the location of
396 values and allowing code to be patched.
399 LLVM's support for generating NEON instructions on big endian ARM targets is
400 somewhat nonintuitive. This document explains the implementation and rationale.
402 :doc:`CoverageMappingFormat`
403 This describes the format and encoding used for LLVM’s code coverage mapping.
406 This describes a set of experimental extensions for garbage
409 :doc:`MergeFunctions`
410 Describes functions merging optimization.
413 Description of the ``inalloca`` argument attribute.
416 LLVM support for folding control flow into faulting machine instructions.
418 :doc:`CompileCudaWithLLVM`
419 LLVM support for CUDA.
422 LLVM support for coroutines.
425 This describes the prototype instruction selection replacement, GlobalISel.
428 High-level documentation of how to use XRay in LLVM.
431 An example of how to debug an application with XRay.
433 :doc:`The Microsoft PDB File Format <PDB/index>`
434 A detailed description of the Microsoft PDB (Program Database) file format.
437 A description of the verification tool for Control Flow Integrity.
439 :doc:`SpeculativeLoadHardening`
440 A description of the Speculative Load Hardening mitigation for Spectre v1.
442 :doc:`StackSafetyAnalysis`
443 This document describes the design of the stack safety analysis of local
446 Development Process Documentation
447 =================================
449 Information about LLVM's development process.
465 An overview on how to contribute to LLVM.
467 :doc:`DeveloperPolicy`
468 The LLVM project's policy towards developers and their contributions.
471 How-to guide and templates for new projects that *use* the LLVM
472 infrastructure. The templates (directory organization, Makefiles, and test
473 tree) allow the project code to be located outside (or inside) the ``llvm/``
474 tree, while using LLVM header files and libraries.
477 Describes the LLVMBuild organization and files used by LLVM to specify
478 component descriptions.
480 :doc:`HowToReleaseLLVM`
481 This is a guide to preparing LLVM releases. Most developers can ignore it.
483 :doc:`ReleaseProcess`
484 This is a guide to validate a new release, during the release process. Most developers can ignore it.
487 Advice on packaging LLVM into a distribution.
490 Describes how to use the Phabricator code review tool hosted on
491 http://reviews.llvm.org/ and its command line interface, Arcanist.
494 Describes how bugs are reported, triaged and closed.
499 LLVM has a thriving community of friendly and helpful developers.
500 The two primary communication mechanisms in the LLVM community are mailing
506 If you can't find what you need in these docs, try consulting the mailing
509 `Developer's List (llvm-dev)`__
510 This list is for people who want to be included in technical discussions of
511 LLVM. People post to this list when they have questions about writing code
512 for or using the LLVM tools. It is relatively low volume.
514 .. __: http://lists.llvm.org/mailman/listinfo/llvm-dev
516 `Commits Archive (llvm-commits)`__
517 This list contains all commit messages that are made when LLVM developers
518 commit code changes to the repository. It also serves as a forum for
519 patch review (i.e. send patches here). It is useful for those who want to
520 stay on the bleeding edge of LLVM development. This list is very high
523 .. __: http://lists.llvm.org/pipermail/llvm-commits/
525 `Bugs & Patches Archive (llvm-bugs)`__
526 This list gets emailed every time a bug is opened and closed. It is
527 higher volume than the LLVM-dev list.
529 .. __: http://lists.llvm.org/pipermail/llvm-bugs/
531 `Test Results Archive (llvm-testresults)`__
532 A message is automatically sent to this list by every active nightly tester
533 when it completes. As such, this list gets email several times each day,
534 making it a high volume list.
536 .. __: http://lists.llvm.org/pipermail/llvm-testresults/
538 `LLVM Announcements List (llvm-announce)`__
539 This is a low volume list that provides important announcements regarding
540 LLVM. It gets email about once a month.
542 .. __: http://lists.llvm.org/mailman/listinfo/llvm-announce
547 Users and developers of the LLVM project (including subprojects such as Clang)
548 can be found in #llvm on `irc.oftc.net <irc://irc.oftc.net/llvm>`_.
550 This channel has several bots.
554 * llvmbb - Bot for the main LLVM buildbot master.
555 http://lab.llvm.org:8011/console
556 * bb-chapuni - An individually run buildbot master. http://bb.pgr.jp/console
557 * smooshlab - Apple's internal buildbot master.
559 * robot - Bugzilla linker. %bug <number>
561 * clang-bot - A `geordi <http://www.eelis.net/geordi/>`_ instance running
562 near-trunk clang instead of gcc.
564 Community wide proposals
565 ------------------------
567 Proposals for massive changes in how the community behaves and how the work flow
576 Proposals/VectorizationPlan
579 Proposal to adopt a code of conduct on the LLVM social spaces (lists, events,
582 :doc:`Proposals/GitHubMove`
583 Proposal to move from SVN/Git to GitHub.
585 :doc:`Proposals/TestSuite`
586 Proposals for additional benchmarks/programs for llvm's test-suite.
588 :doc:`Proposals/VectorizationPlan`
589 Proposal to model the process and upgrade the infrastructure of LLVM's Loop Vectorizer.