llvm.org GIT mirror llvm / release_80 docs / index.rst
release_80

Tree @release_80 (Download .tar.gz)

index.rst @release_80

21e993c
 
 
 
 
 
 
 
d9b0b02
21e993c
31da439
 
21e993c
31da439
21e993c
31da439
 
 
 
 
52878db
31da439
 
52878db
31da439
 
52878db
31da439
52878db
31da439
 
52878db
31da439
52878db
 
31da439
 
52878db
31da439
52878db
31da439
 
52878db
31da439
52878db
 
31da439
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
ae143ce
eceee13
31da439
1517625
51bcf5f
8216947
31da439
 
 
 
 
 
 
 
 
d78e434
31da439
 
 
 
 
 
cad9b9c
b16dac5
0774681
348a232
6966267
348a232
01c176b
83aa9ad
31da439
52878db
31da439
 
 
 
52878db
31da439
 
 
52878db
31da439
 
1517625
 
 
51bcf5f
 
 
8216947
 
 
52878db
31da439
 
 
52878db
31da439
 
 
52878db
31da439
 
21e993c
52878db
31da439
21e993c
52878db
31da439
21e993c
52878db
31da439
21e993c
52878db
31da439
 
21e993c
52878db
31da439
 
21e993c
52878db
31da439
 
64a07d9
 
 
52878db
31da439
 
52878db
31da439
52878db
31da439
 
52878db
31da439
 
52878db
31da439
 
cad9b9c
 
 
 
b16dac5
bbb3280
b16dac5
 
83aa9ad
 
 
b16dac5
31da439
 
 
 
21e993c
 
31da439
 
 
 
 
 
 
 
 
18d49ac
3506457
89b77ce
994c559
bc94ace
31da439
52878db
31da439
 
 
52878db
31da439
 
52878db
31da439
 
 
18d49ac
 
 
52878db
31da439
 
52878db
31da439
 
 
52878db
31da439
 
 
52878db
31da439
 
52878db
31da439
 
0ba9a7e
 
8986b31
52878db
31da439
52878db
31da439
 
3506457
 
 
89b77ce
 
 
994c559
 
 
bc94ace
 
 
98977ed
 
31da439
 
 
 
 
 
 
 
 
6058aba
31da439
23a6033
31da439
 
 
 
 
 
 
1625937
31da439
 
 
 
cd4dcda
31da439
 
 
 
 
0013a5d
531ebc8
953c681
e97b132
aede1c9
8591804
e3cea5f
99eff50
4912640
dba9146
9a395de
deca672
32dcc28
e48bbc4
bbf0c3a
f70da78
8cefdcb
630a4ac
ab792ca
bbb3280
d78e434
d305cea
31da439
52878db
31da439
 
52878db
31da439
 
52878db
31da439
 
 
 
32dcc28
 
 
 
ba9e79f
31da439
 
 
52878db
31da439
 
 
6058aba
 
 
52878db
31da439
 
 
52878db
31da439
 
 
52878db
31da439
 
52878db
31da439
 
 
52878db
31da439
 
 
52878db
31da439
 
cd4dcda
 
31da439
 
52878db
31da439
 
 
52878db
31da439
 
52878db
31da439
 
23dcb18
 
 
52878db
31da439
 
23a6033
 
 
 
52878db
31da439
 
52878db
31da439
 
0013a5d
 
31da439
531ebc8
6986553
531ebc8
953c681
6986553
19cb35b
e97b132
 
 
531ebc8
8591804
 
 
 
e3cea5f
 
8591804
99eff50
 
 
 
4912640
 
 
54a6137
 
 
deca672
 
 
6966267
 
 
e48bbc4
 
 
bbf0c3a
 
 
f70da78
 
 
21463ca
 
 
ab792ca
 
 
bbb3280
 
 
d78e434
 
 
d305cea
 
 
 
31da439
 
 
 
 
 
 
 
98977ed
a6a2223
31da439
 
 
ae70224
0774681
17dfc38
1f633af
31da439
98977ed
 
 
a6a2223
 
 
52878db
31da439
 
 
 
 
52878db
31da439
 
 
52878db
31da439
 
fe4716f
72db9e5
fe4716f
ae70224
 
 
17dfc38
 
 
 
1f633af
 
 
bd1aecb
 
 
 
 
 
 
31da439
bd1aecb
31da439
 
 
 
377a984
31da439
 
 
 
377a984
31da439
fb7aa39
31da439
6ef362a
 
 
 
31da439
377a984
31da439
377a984
6ef362a
377a984
1358565
377a984
1358565
fb7aa39
31da439
 
 
 
377a984
52878db
fb7aa39
1358565
 
 
377a984
1358565
bd1aecb
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
0aa76a9
 
 
 
 
 
 
 
 
 
d6afe38
39f6fac
98be03e
0aa76a9
 
 
 
 
d6afe38
0aa76a9
 
39f6fac
 
 
98be03e
 
bd1aecb
21e993c
 
 
 
 
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
Overview
========

The LLVM compiler infrastructure supports a wide range of projects, from
industrial strength compilers to specialized JIT applications to small
research projects.

Similarly, documentation is broken down into several high-level groupings
targeted at different audiences:

LLVM Design & Overview
======================

Several introductory papers and presentations.

.. toctree::
   :hidden:

   LangRef

:doc:`LangRef`
  Defines the LLVM intermediate representation.

`Introduction to the LLVM Compiler`__
  Presentation providing a users introduction to LLVM.

  .. __: http://llvm.org/pubs/2008-10-04-ACAT-LLVM-Intro.html

`Intro to LLVM`__
  Book chapter providing a compiler hacker's introduction to LLVM.

  .. __: http://www.aosabook.org/en/llvm.html


`LLVM: A Compilation Framework for Lifelong Program Analysis & Transformation`__
  Design overview.

  .. __: http://llvm.org/pubs/2004-01-30-CGO-LLVM.html

`LLVM: An Infrastructure for Multi-Stage Optimization`__
  More details (quite old now).

  .. __: http://llvm.org/pubs/2002-12-LattnerMSThesis.html

`Publications mentioning LLVM <http://llvm.org/pubs>`_
   ..

User Guides
===========

For those new to the LLVM system.

NOTE: If you are a user who is only interested in using LLVM-based
compilers, you should look into `Clang <http://clang.llvm.org>`_ or
`DragonEgg <http://dragonegg.llvm.org>`_ instead. The documentation here is
intended for users who have a need to work with the intermediate LLVM
representation.

.. toctree::
   :hidden:

   CMake
   CMakePrimer
   AdvancedBuilds
   HowToBuildOnARM
   HowToBuildWithPGO
   HowToCrossCompileBuiltinsOnArm
   HowToCrossCompileLLVM
   CommandGuide/index
   GettingStarted
   GettingStartedVS
   FAQ
   Lexicon
   HowToAddABuilder
   yaml2obj
   HowToSubmitABug
   SphinxQuickstartTemplate
   MarkdownQuickstartTemplate
   Phabricator
   TestingGuide
   tutorial/index
   ReleaseNotes
   Passes
   YamlIO
   GetElementPtr
   Frontend/PerformanceTips
   MCJITDesignAndImplementation
   CodeOfConduct
   CompileCudaWithLLVM
   ReportingGuide
   Benchmarking
   Docker

:doc:`GettingStarted`
   Discusses how to get up and running quickly with the LLVM infrastructure.
   Everything from unpacking and compilation of the distribution to execution
   of some tools.

:doc:`CMake`
   An addendum to the main Getting Started guide for those using the `CMake
   build system <http://www.cmake.org>`_.

:doc:`HowToBuildOnARM`
   Notes on building and testing LLVM/Clang on ARM.

:doc:`HowToBuildWithPGO`
    Notes on building LLVM/Clang with PGO.

:doc:`HowToCrossCompileBuiltinsOnArm`
   Notes on cross-building and testing the compiler-rt builtins for Arm.

:doc:`HowToCrossCompileLLVM`
   Notes on cross-building and testing LLVM/Clang.

:doc:`GettingStartedVS`
   An addendum to the main Getting Started guide for those using Visual Studio
   on Windows.

:doc:`tutorial/index`
   Tutorials about using LLVM. Includes a tutorial about making a custom
   language with LLVM.

:doc:`LLVM Command Guide <CommandGuide/index>`
   A reference manual for the LLVM command line utilities ("man" pages for LLVM
   tools).

:doc:`Passes`
   A list of optimizations and analyses implemented in LLVM.

:doc:`FAQ`
   A list of common questions and problems and their solutions.

:doc:`Release notes for the current release <ReleaseNotes>`
   This describes new features, known bugs, and other limitations.

:doc:`HowToSubmitABug`
   Instructions for properly submitting information about any bugs you run into
   in the LLVM system.

:doc:`SphinxQuickstartTemplate`
  A template + tutorial for writing new Sphinx documentation. It is meant
  to be read in source form.

:doc:`LLVM Testing Infrastructure Guide <TestingGuide>`
   A reference manual for using the LLVM testing infrastructure.

:doc:`TestSuiteGuide`
  Describes how to compile and run the test-suite benchmarks.

`How to build the C, C++, ObjC, and ObjC++ front end`__
   Instructions for building the clang front-end from source.

   .. __: http://clang.llvm.org/get_started.html

:doc:`Lexicon`
   Definition of acronyms, terms and concepts used in LLVM.

:doc:`HowToAddABuilder`
   Instructions for adding new builder to LLVM buildbot master.

:doc:`YamlIO`
   A reference guide for using LLVM's YAML I/O library.

:doc:`GetElementPtr`
  Answers to some very frequent questions about LLVM's most frequently
  misunderstood instruction.

:doc:`Frontend/PerformanceTips`
   A collection of tips for frontend authors on how to generate IR
   which LLVM is able to effectively optimize.

:doc:`Docker`
   A reference for using Dockerfiles provided with LLVM.


Programming Documentation
=========================

For developers of applications which use LLVM as a library.

.. toctree::
   :hidden:

   Atomics
   CodingStandards
   CommandLine
   CompilerWriterInfo
   ExtendingLLVM
   HowToSetUpLLVMStyleRTTI
   ProgrammersManual
   Extensions
   LibFuzzer
   FuzzingLLVM
   ScudoHardenedAllocator
   OptBisect

:doc:`LLVM Language Reference Manual <LangRef>`
  Defines the LLVM intermediate representation and the assembly form of the
  different nodes.

:doc:`Atomics`
  Information about LLVM's concurrency model.

:doc:`ProgrammersManual`
  Introduction to the general layout of the LLVM sourcebase, important classes
  and APIs, and some tips & tricks.

:doc:`Extensions`
  LLVM-specific extensions to tools and formats LLVM seeks compatibility with.

:doc:`CommandLine`
  Provides information on using the command line parsing library.

:doc:`CodingStandards`
  Details the LLVM coding standards and provides useful information on writing
  efficient C++ code.

:doc:`HowToSetUpLLVMStyleRTTI`
  How to make ``isa<>``, ``dyn_cast<>``, etc. available for clients of your
  class hierarchy.

:doc:`ExtendingLLVM`
  Look here to see how to add instructions and intrinsics to LLVM.

`Doxygen generated documentation <http://llvm.org/doxygen/>`_
  (`classes <http://llvm.org/doxygen/inherits.html>`_)

`Documentation for Go bindings <http://godoc.org/llvm.org/llvm/bindings/go/llvm>`_

`Github Source Repository Browser <http://github.com/llvm/llvm-project//>`_
   ..

:doc:`CompilerWriterInfo`
  A list of helpful links for compiler writers.

:doc:`LibFuzzer`
  A library for writing in-process guided fuzzers.

:doc:`FuzzingLLVM`
  Information on writing and using Fuzzers to find bugs in LLVM.

:doc:`ScudoHardenedAllocator`
  A library that implements a security-hardened `malloc()`.

:doc:`OptBisect`
  A command line option for debugging optimization-induced failures.

.. _index-subsystem-docs:

Subsystem Documentation
=======================

For API clients and LLVM developers.

.. toctree::
   :hidden:

   AliasAnalysis
   MemorySSA
   BitCodeFormat
   BlockFrequencyTerminology
   BranchWeightMetadata
   Bugpoint
   CodeGenerator
   ExceptionHandling
   LinkTimeOptimization
   SegmentedStacks
   TableGenFundamentals
   TableGen/index
   DebuggingJITedCode
   GoldPlugin
   MarkedUpDisassembly
   SystemLibrary
   SupportLibrary
   SourceLevelDebugging
   Vectorizers
   WritingAnLLVMBackend
   GarbageCollection
   WritingAnLLVMPass
   HowToUseAttributes
   NVPTXUsage
   AMDGPUUsage
   StackMaps
   InAlloca
   BigEndianNEON
   CoverageMappingFormat
   Statepoints
   MergeFunctions
   TypeMetadata
   TransformMetadata
   FaultMaps
   MIRLangRef
   Coroutines
   GlobalISel
   XRay
   XRayExample
   XRayFDRFormat
   PDB/index
   CFIVerify
   SpeculativeLoadHardening
   StackSafetyAnalysis

:doc:`WritingAnLLVMPass`
   Information on how to write LLVM transformations and analyses.

:doc:`WritingAnLLVMBackend`
   Information on how to write LLVM backends for machine targets.

:doc:`CodeGenerator`
   The design and implementation of the LLVM code generator.  Useful if you are
   working on retargetting LLVM to a new architecture, designing a new codegen
   pass, or enhancing existing components.

:doc:`Machine IR (MIR) Format Reference Manual <MIRLangRef>`
   A reference manual for the MIR serialization format, which is used to test
   LLVM's code generation passes.

:doc:`TableGen <TableGen/index>`
   Describes the TableGen tool, which is used heavily by the LLVM code
   generator.

:doc:`AliasAnalysis`
   Information on how to write a new alias analysis implementation or how to
   use existing analyses.

:doc:`MemorySSA`
   Information about the MemorySSA utility in LLVM, as well as how to use it.

:doc:`GarbageCollection`
   The interfaces source-language compilers should use for compiling GC'd
   programs.

:doc:`Source Level Debugging with LLVM <SourceLevelDebugging>`
   This document describes the design and philosophy behind the LLVM
   source-level debugger.

:doc:`Vectorizers`
   This document describes the current status of vectorization in LLVM.

:doc:`ExceptionHandling`
   This document describes the design and implementation of exception handling
   in LLVM.

:doc:`Bugpoint`
   Automatic bug finder and test-case reducer description and usage
   information.

:doc:`BitCodeFormat`
   This describes the file format and encoding used for LLVM "bc" files.

:doc:`Support Library <SupportLibrary>`
   This document describes the LLVM Support Library (``lib/Support``) and
   how to keep LLVM source code portable

:doc:`LinkTimeOptimization`
   This document describes the interface between LLVM intermodular optimizer
   and the linker and its design

:doc:`GoldPlugin`
   How to build your programs with link-time optimization on Linux.

:doc:`DebuggingJITedCode`
   How to debug JITed code with GDB.

:doc:`MCJITDesignAndImplementation`
   Describes the inner workings of MCJIT execution engine.

:doc:`BranchWeightMetadata`
   Provides information about Branch Prediction Information.

:doc:`BlockFrequencyTerminology`
   Provides information about terminology used in the ``BlockFrequencyInfo``
   analysis pass.

:doc:`SegmentedStacks`
   This document describes segmented stacks and how they are used in LLVM.

:doc:`MarkedUpDisassembly`
   This document describes the optional rich disassembly output syntax.

:doc:`HowToUseAttributes`
  Answers some questions about the new Attributes infrastructure.

:doc:`NVPTXUsage`
   This document describes using the NVPTX backend to compile GPU kernels.

:doc:`AMDGPUUsage`
   This document describes using the AMDGPU backend to compile GPU kernels.

:doc:`StackMaps`
  LLVM support for mapping instruction addresses to the location of
  values and allowing code to be patched.

:doc:`BigEndianNEON`
  LLVM's support for generating NEON instructions on big endian ARM targets is
  somewhat nonintuitive. This document explains the implementation and rationale.

:doc:`CoverageMappingFormat`
  This describes the format and encoding used for LLVM’s code coverage mapping.

:doc:`Statepoints`
  This describes a set of experimental extensions for garbage
  collection support.

:doc:`MergeFunctions`
  Describes functions merging optimization.

:doc:`InAlloca`
  Description of the ``inalloca`` argument attribute.

:doc:`FaultMaps`
  LLVM support for folding control flow into faulting machine instructions.

:doc:`CompileCudaWithLLVM`
  LLVM support for CUDA.

:doc:`Coroutines`
  LLVM support for coroutines.

:doc:`GlobalISel`
  This describes the prototype instruction selection replacement, GlobalISel.

:doc:`XRay`
  High-level documentation of how to use XRay in LLVM.

:doc:`XRayExample`
  An example of how to debug an application with XRay.

:doc:`The Microsoft PDB File Format <PDB/index>`
  A detailed description of the Microsoft PDB (Program Database) file format.

:doc:`CFIVerify`
  A description of the verification tool for Control Flow Integrity.

:doc:`SpeculativeLoadHardening`
  A description of the Speculative Load Hardening mitigation for Spectre v1.

:doc:`StackSafetyAnalysis`
  This document describes the design of the stack safety analysis of local
  variables.

Development Process Documentation
=================================

Information about LLVM's development process.

.. toctree::
   :hidden:

   Contributing
   DeveloperPolicy
   Projects
   LLVMBuild
   HowToReleaseLLVM
   Packaging
   ReleaseProcess
   Phabricator
   BugLifeCycle

:doc:`Contributing`
   An overview on how to contribute to LLVM.

:doc:`DeveloperPolicy`
   The LLVM project's policy towards developers and their contributions.

:doc:`Projects`
  How-to guide and templates for new projects that *use* the LLVM
  infrastructure.  The templates (directory organization, Makefiles, and test
  tree) allow the project code to be located outside (or inside) the ``llvm/``
  tree, while using LLVM header files and libraries.

:doc:`LLVMBuild`
  Describes the LLVMBuild organization and files used by LLVM to specify
  component descriptions.

:doc:`HowToReleaseLLVM`
  This is a guide to preparing LLVM releases. Most developers can ignore it.

:doc:`ReleaseProcess`
  This is a guide to validate a new release, during the release process. Most developers can ignore it.

:doc:`Packaging`
   Advice on packaging LLVM into a distribution.

:doc:`Phabricator`
   Describes how to use the Phabricator code review tool hosted on
   http://reviews.llvm.org/ and its command line interface, Arcanist.

:doc:`BugLifeCycle`
   Describes how bugs are reported, triaged and closed.

Community
=========

LLVM has a thriving community of friendly and helpful developers.
The two primary communication mechanisms in the LLVM community are mailing
lists and IRC.

Mailing Lists
-------------

If you can't find what you need in these docs, try consulting the mailing
lists.

`Developer's List (llvm-dev)`__
  This list is for people who want to be included in technical discussions of
  LLVM. People post to this list when they have questions about writing code
  for or using the LLVM tools. It is relatively low volume.

  .. __: http://lists.llvm.org/mailman/listinfo/llvm-dev

`Commits Archive (llvm-commits)`__
  This list contains all commit messages that are made when LLVM developers
  commit code changes to the repository. It also serves as a forum for
  patch review (i.e. send patches here). It is useful for those who want to
  stay on the bleeding edge of LLVM development. This list is very high
  volume.

  .. __: http://lists.llvm.org/pipermail/llvm-commits/

`Bugs & Patches Archive (llvm-bugs)`__
  This list gets emailed every time a bug is opened and closed. It is
  higher volume than the LLVM-dev list.

  .. __: http://lists.llvm.org/pipermail/llvm-bugs/

`Test Results Archive (llvm-testresults)`__
  A message is automatically sent to this list by every active nightly tester
  when it completes.  As such, this list gets email several times each day,
  making it a high volume list.

  .. __: http://lists.llvm.org/pipermail/llvm-testresults/

`LLVM Announcements List (llvm-announce)`__
  This is a low volume list that provides important announcements regarding
  LLVM.  It gets email about once a month.

  .. __: http://lists.llvm.org/mailman/listinfo/llvm-announce

IRC
---

Users and developers of the LLVM project (including subprojects such as Clang)
can be found in #llvm on `irc.oftc.net <irc://irc.oftc.net/llvm>`_.

This channel has several bots.

* Buildbot reporters

  * llvmbb - Bot for the main LLVM buildbot master.
    http://lab.llvm.org:8011/console
  * bb-chapuni - An individually run buildbot master. http://bb.pgr.jp/console
  * smooshlab - Apple's internal buildbot master.

* robot - Bugzilla linker. %bug <number>

* clang-bot - A `geordi <http://www.eelis.net/geordi/>`_ instance running
  near-trunk clang instead of gcc.

Community wide proposals
------------------------

Proposals for massive changes in how the community behaves and how the work flow
can be better.

.. toctree::
   :hidden:

   CodeOfConduct
   Proposals/GitHubMove
   Proposals/TestSuite
   Proposals/VectorizationPlan

:doc:`CodeOfConduct`
   Proposal to adopt a code of conduct on the LLVM social spaces (lists, events,
   IRC, etc).

:doc:`Proposals/GitHubMove`
   Proposal to move from SVN/Git to GitHub.

:doc:`Proposals/TestSuite`
   Proposals for additional benchmarks/programs for llvm's test-suite.

:doc:`Proposals/VectorizationPlan`
   Proposal to model the process and upgrade the infrastructure of LLVM's Loop Vectorizer.

Indices and tables
==================

* :ref:`genindex`
* :ref:`search`