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Vedant Kumar 4bb4e2c912 [docs] UBSan: Mention that print_stacktrace=1 is unsupported on Darwin 
Printing out stack traces along with UBSan diagnostics is unsupported on
Darwin. That's because it isn't possible to use the fast unwinder or the
slow unwinder.

Apparently, it's inappropriate to use the fast unwinder for UBSan
issues. I'm not exactly sure why (see the comment in ubsan_diag.cc).
Forcing use of the fast unwinder produces decent results, AFAICT.

Darwin also does not appear to have a slow unwinder suitable for use
with the sanitizers. Apparently that's because of PR20800 [1][2]. But
that bug has been fixed. I'm not sure if there is anything preventing
use of the slow unwinder now.

Currently, passing UBSAN_OPTIONS=print_stacktrace=1 does nothing on
Darwin. This isn't good, but it might be a while before we can fix the
situation, so we should at least document it.

[1] https://github.com/google/sanitizers/issues/137
"We can't use the slow unwinder on OSX now, because Clang produces
incorrect unwind info for the ASan runtime functions on OSX
(http://llvm.org/PR20800)."

[2] https://bugs.llvm.org/show_bug.cgi?id=20800
Bug 20800 - Invalid compact unwind info generated for a function without
frame pointers on OSX

llvm-svn: 300295
 		2017-04-14 01:59:44 +00:00
..
CommandGuide Driver: Remove support for -fobjc-gc* 2016-12-07 00:31:10 +00:00
analyzer [analyzer] Improve usability of ExprInspectionChecker 2017-03-09 00:01:10 +00:00
tools [clang-format] Add more examples and fix a bug in the py generation script 2017-03-13 14:42:47 +00:00
AddressSanitizer.rst [asan][docs] Fix the documentation to use clang++ for the C++ example 2016-12-15 22:55:21 +00:00
AttributeReference.rst Adding a title to appease the sphinx build bot. 2015-06-23 17:31:30 +00:00
AutomaticReferenceCounting.rst docs: update docs for objc_storeStrong behaviour 2017-02-11 17:24:09 +00:00
Block-ABI-Apple.rst Fix example: byref struct's init was incorrect, and the block literal's holder should point to it. 2016-12-22 23:48:23 +00:00
Block-ABI-Apple.txt
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BlockLanguageSpec.rst
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CMakeLists.txt Fix build. 2016-04-28 14:28:19 +00:00
ClangCheck.rst [clang docs] Minor fix in ClangCheck.rst 2016-11-14 17:31:24 +00:00
ClangCommandLineReference.rst [docs] Fix a couple of typos in command line flag help text and regenerate documentation. 2017-04-13 22:39:49 +00:00
ClangFormat.rst Add the --no-color option to the git call in the doc when using clang-format-diff 2016-12-03 23:22:45 +00:00
ClangFormatStyleOptions.rst Add more examples to clang-format configuration 2017-04-11 07:07:05 +00:00
ClangPlugins.rst Removing more :option: tags that we do not have corresponding .. option directives for; these are causing the sphinx bot to fail (http://lab.llvm.org:8011/builders/clang-sphinx-docs/builds/15195/steps/docs-clang-html/logs/stdio). 2016-07-14 14:07:37 +00:00
ClangTools.rst Fixed a link. 2015-11-04 19:42:17 +00:00
ControlFlowIntegrity.rst Re-apply r267784, r267824 and r267830. 2016-04-28 17:09:37 +00:00
ControlFlowIntegrityDesign.rst Proposal: Backward-edge CFI for return statements (RCFI) 2017-03-20 20:42:00 +00:00
CrossCompilation.rst [docs] Use x86_64 and i386 instead of x86 as arch for triples. 2016-12-05 22:52:20 +00:00
DataFlowSanitizer.rst
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DataFlowSanitizerDesign.rst
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DiagnosticsReference.rst [docs] Regenerate diagnostics reference. 2017-04-13 22:44:22 +00:00
DriverArchitecture.png
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DriverInternals.rst Driver: Replace a couple of out of date terms in the docs 2015-07-03 08:03:43 +00:00
ExternalClangExamples.rst Add LibreOffice Clang plugin to ExternalClangExamples.rst 2017-03-22 08:45:49 +00:00
FAQ.rst
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HowToSetupToolingForLLVM.rst Fixed a typo (compilation_commands.json --> compile_commands.json). 2016-08-19 13:36:31 +00:00
InternalsManual.rst [docs] Change non-c++ code blocks to 'text' format to fix a sphinx warning. 2016-02-24 15:07:48 +00:00
IntroductionToTheClangAST.rst
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ItaniumMangleAbiTags.rst NFC fix documentation build by rL263015 2016-03-09 19:39:16 +00:00
JSONCompilationDatabase.rst Extend CompilationDatabase by a field for the output filename 2016-12-01 23:37:45 +00:00
LTOVisibility.rst docs: Use the term "whole-program devirtualization" instead of "virtual function call optimization". 2017-04-10 23:54:28 +00:00
LanguageExtensions.rst [Sema] Add __is_aggregate type-trait 2017-04-12 22:12:15 +00:00
LeakSanitizer.rst [Docs] Slightly update LSan documentation. 2016-01-22 01:35:45 +00:00
LibASTMatchers.rst Typo fix in AST matcher documentation: s/aribtrary/arbitrary/ 2016-12-31 01:04:02 +00:00
LibASTMatchersReference.html [ASTMatchers] add typeAliasTemplateDecl matcher. 2017-03-28 12:56:47 +00:00
LibASTMatchersTutorial.rst [clang] Minor fix to libASTMatcherTutorial 2016-12-30 20:49:44 +00:00
LibFormat.rst
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LibTooling.rst
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MSVCCompatibility.rst Update MSVC compat docs about debug info 2016-12-14 21:34:19 +00:00
Makefile.sphinx docs: Clarify that cfi-unrelated-cast is based on lifetime. 2016-02-01 18:55:50 +00:00
MemorySanitizer.rst [docs] Update the TSan and MSan docs to refer to the new no_sanitize attribute 2016-10-27 21:38:44 +00:00
Modules.rst [Modules] Add documentation on private frameworks 2017-03-16 23:18:55 +00:00
ObjectiveCLiterals.rst Fix typo. NFC. 2015-06-27 19:04:55 +00:00
PCHInternals.rst Removing a few more :option: tags that we do not have corresponding .. option directives for; these are causing the sphinx bot to fail (http://lab.llvm.org:8011/builders/clang-sphinx-docs/builds/15197/steps/docs-clang-html/logs/stdio). 2016-07-14 15:32:11 +00:00
PCHLayout.graffle
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PCHLayout.png
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PTHInternals.rst PTHInternals.rst: PCH is now a thing, update docs to reflect it 2014-07-07 14:02:39 +00:00
RAVFrontendAction.rst docs: Remove references to the long-defunct LLVM_USED_LIBS 2015-11-26 19:52:24 +00:00
README.txt
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ReleaseNotes.rst Fix some sphinx -Werror's 2017-03-20 17:07:49 +00:00
SafeStack.rst docs: Document how safestack handles setjmp and exceptions. 2016-05-24 23:38:02 +00:00
SanitizerCoverage.rst [sancov] pc_guard_init is called at least once per DSO. 2017-02-08 21:28:39 +00:00
SanitizerSpecialCaseList.rst
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SanitizerStats.rst Introduce -fsanitize-stats flag. 2016-01-16 00:31:22 +00:00
SourceBasedCodeCoverage.rst [docs] coverage: Clarify which flags enable gcov-style profiling (NFC) 2017-02-09 21:33:21 +00:00
ThinLTO.rst [ThinLTO] Update doc to include lld (now supported). 2016-10-13 17:42:38 +00:00
ThreadSafetyAnalysis.rst Updating the documentation to include an operator! for negative capability support. 2015-05-22 13:36:48 +00:00
ThreadSanitizer.rst [docs] Update the TSan and MSan docs to refer to the new no_sanitize attribute 2016-10-27 21:38:44 +00:00
Toolchain.rst Add documentation describing the components of a complete toolchain including Clang. 2016-10-27 20:55:56 +00:00
Tooling.rst
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UndefinedBehaviorSanitizer.rst [docs] UBSan: Mention that print_stacktrace=1 is unsupported on Darwin 2017-04-14 01:59:44 +00:00
UsersManual.rst [Driver] Add compiler option to generate a reproducer 2017-04-12 21:46:20 +00:00
conf.py Update docs/conf.py version 2017-01-12 21:41:38 +00:00
doxygen-mainpage.dox [docs] Add missing file 2016-03-03 10:44:10 +00:00
doxygen.cfg.in [docs] Tell Doxygen to expand LLVM_ALIGNAS to nothing 2017-01-19 09:27:45 +00:00
index.rst [docs] Add TableGen-based generator for command line argument documentation, 2017-01-24 19:39:46 +00:00
make.bat
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README.txt 

See llvm/docs/README.txt